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Sexuality

Anatomy and Physiology · NLM MeSH · updated 2026-10-31 · version 1

Citations verified against PubMedNot yet clinician-reviewed9 referencesApproximately 5 min read

The sexual functions, activities, attitudes, and orientations of an individual.

Table of Contents

1. Definition2. Research landscape3. Reading the evidence4. Open-access studies5. Key reviews6. References7. About this article

Definition and research guide

This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.

Content available: 3 complete abstracts (1,024 words), 9 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.

Definition

The sexual functions, activities, attitudes, and orientations of an individual. Sexuality, male or female, becomes evident at puberty under the influence of gonadal steroids (testosterone or estradiol), and social effects.

Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.

Where it fits in the MeSH classification

Broader topics
Sexual Behavior; Reproductive Physiological Phenomena
Narrower topics
Bisexuality; Heterosexuality; Homosexuality; Transsexualism
See also
Psychosexual Development

Related concepts

  • Puberty
  • Testosterone
  • Estradiol

Research landscape

PubMed indexes 54,442 records tagged with the MeSH heading “Sexuality” (counts retrieved 2026-10-31). 12,853 of them (23.6%) were published from 2020 onward, and the busiest period so far is 2010-2019 with 18,295 records.

Reviews account for 4,685 records (8.6%) and meta-analyses for 399. Randomized controlled trials number 1,028 (1.9%) as a share of all records on the topic. Randomized trials make up only a small share of this literature, so much of what is known comes from laboratory, observational or descriptive work.

PubMed records by publication periodthrough 1999: 13,356 records; 2000-2009: 9,938 records; 2010-2019: 18,295 records; 2020 onward: 12,853 records13,356through 19999,9382000-200918,2952010-201912,8532020 onward
Records in PubMed indexed with this heading, by publication period. Real counts from NCBI E-utilities; the final period covers only part of the current year. Volume reflects how much has been published, not how strong the evidence is.
Show the data
PeriodRecords
through 199913,356
2000-20099,938
2010-201918,295
2020 onward12,853
Share of records by publication typeReviews: 8.6 percent; Meta-analyses: 0.7 percent; Randomized controlled trials: 1.9 percentReviews8.6% (4,685)Meta-analyses0.7% (399)Randomized controlled trials1.9% (1,028)
Share of all PubMed records on this heading that carry each publication type. Types overlap with other records, so the shares do not sum to 100%.
Publication-type chart data
Publication types among 54,442 PubMed records
TypeRecordsShare
Reviews4,6858.6%
Meta-analyses3990.7%
Randomized controlled trials1,0281.9%

Method: PubMed query "Sexuality"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-31.

Reading the evidence in anatomy and physiology

Anatomy describes how body structures are built and physiology describes how they normally work, so most findings here are descriptive or mechanistic rather than evidence about treatment. Much of what is known comes from dissection, imaging, tissue studies and experiments in animals, and measurements in healthy volunteers can differ from those in people with disease or at different ages. Normal ranges vary between individuals and populations. Check whether a result was measured in people or in another species, the age and health of the participants, and the method used.

Evidence from open-access studies

These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.

Study comparison — selected abstracts, not a systematic review
Study / authorsYearSource label / designEurope PMC citationsLicence / source
Chatbot-Delivered Real-Time Support to Improve HIV Self-Testing Rates: A Randomized Clinical Trial
Chen S, Yu FY, Fang Y, Yau J, Ng N, Zhang Q, et al.
2025Randomized controlled trial
Design not recorded in structured metadata
11cc by
PMID 41284298 · DOI · PMC12645333
Perceptions of Long-Acting Injectable Pre-Exposure Prophylaxis Among Men Who Have Sex With Men and Transgender Individuals in Europe Using Structural Text Modeling Technique: Cross-Sectional Study
Wang H, Kolstee J, Martinez JC, van de Vijver D, Tosh J, Schroeder M, et al.
2025Research article
Design not recorded in structured metadata
5cc by
PMID 40938647 · DOI · PMC12475884
Exploring the Interest and Intention to Use Long-Acting Injectable PrEP (LAI-PrEP) Among Gay, Bisexual and Other Men Who Have Sex with Men (GBMSM) in the Netherlands
Kolstee J, Wang H, Zimmermann H, Schroeder M, Appiah A, Sarkar S, et al.
2026Research article
Design not recorded in structured metadata
4cc by
PMID 41579236 · DOI · PMC13400490

Chatbot-Delivered Real-Time Support to Improve HIV Self-Testing Rates: A Randomized Clinical Trial [1]

Randomized controlled trial Chen S, Yu FY, Fang Y, Yau J, Ng N, Zhang Q, et al. · · 2025 · cited 11 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
ImportanceHIV self-testing (HIVST) with online real-time support by human administrators (HIVST-OIC) is an evidence-based HIV intervention for men who have sex with men (MSM) but requires intensive resources to implement.
Closing excerpt
gov Identifier: NCT05796622.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (332 words)

ImportanceHIV self-testing (HIVST) with online real-time support by human administrators (HIVST-OIC) is an evidence-based HIV intervention for men who have sex with men (MSM) but requires intensive resources to implement.ObjectiveTo investigate whether a novel HIVST service using a chatbot to deliver online real-time instruction and counseling support (HIVST-chatbot) is noninferior to the HIVST-OIC in increasing HIVST uptake and counseling support for MSM.Design, setting, and participantsA partially blinded, parallel-group, and noninferiority randomized clinical trial was conducted between April 16, 2023, and May 31, 2024, in Hong Kong, China. Eligible participants were Hong Kong-based, Chinese-speaking MSM 18 years or older who reported anal intercourse with men in the past 6 months and had access to WhatsApp. Participants were recruited via gay venues, online recruitment, and peer referrals and then randomized to the HIVST-chatbot or HIVST-OIC groups. Both intention-to-treat (ITT) and complete case analyses were performed. The noninferiority margin was set at 10 percentage points.InterventionsStandard-of-care pretest and posttest counseling was delivered by a chatbot for the HIVST-chatbot group and by trained human administrators in the HIVST-OIC group. Both groups received free HIVST kits.Main outcomes and measuresPrimary outcomes included self-reported HIVST uptake and receiving any counseling support along with HIVST, validated by the research team.ResultsA total of 531 participants (mean [SD] age, 34.8 [9.3] years) were randomized to either the HIVST-chatbot (n = 266) or HIVST-OIC (n = 265) groups. In ITT analysis, the HIVST-chatbot was noninferior to the HIVST-OIC in increasing HIVST uptake (216 [81.2%] vs 227 [85.7%]; proportion difference, -4.5 percentage points; 95% CI, -9.8 to 0.8 percentage points; 1-sided P = .10) and proportion of HIVST users who received counseling support (197 [91.2%] vs 142 [62.6%]; proportion difference, 28.7 percentage points; 95% CI, 22.5 to 34.8 percentage points; 1-sided P Conclusions and relevanceIn this randomized clinical trial, the HIVST-chatbot was noninferior to the HIVST-OIC in increasing HIVST uptake and counseling among HIVST users. These results suggest that the HIVST-chatbot might be an alternative to the evidence-based HIVST-OIC service for MSM.Trial registrationClinicalTrial.gov Identifier: NCT05796622.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41284298 · DOI · PMC12645333

Perceptions of Long-Acting Injectable Pre-Exposure Prophylaxis Among Men Who Have Sex With Men and Transgender Individuals in Europe Using Structural Text Modeling Technique: Cross-Sectional Study [2]

Research article Wang H, Kolstee J, Martinez JC, van de Vijver D, Tosh J, Schroeder M, et al. · · 2025 · cited 5 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
BackgroundOral pre-exposure prophylaxis (PrEP) effectively prevents HIV but remains unevenly accessible across Europe.
Closing excerpt
To support potential future LA-PrEP implementation in Europe and to maximize its impact, appropriate communication strategies are essential for supporting informed decision-making.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (445 words)

BackgroundOral pre-exposure prophylaxis (PrEP) effectively prevents HIV but remains unevenly accessible across Europe. Long-acting PrEP (LA-PrEP), recently approved in Europe, offers new HIV protection options. However, no qualitative evidence is available to inform people's perceptions of this novel modality.ObjectiveThis study provides the first large-scale, qualitative evidence in English from 20 European countries on how men who have sex with men (MSM) and trans* individuals perceive LA-PrEP.MethodsWe analyzed open-ended responses from 3123 HIV-negative MSM and trans* individuals from 20 European countries who completed the PROTECT survey in English. Participants were asked to describe what LA-PrEP means to them using words or short phrases. We used word clouds for initial insights and structural topic modeling to identify topics and explore their relevance across socioeconomic status, migration background, oral PrEP use, and affordability and the association of these perceptions with LA-PrEP intention.ResultsThe responses reflected generally positive associations toward LA-PrEP, with the most frequently mentioned word being "safe," "freedom," and "convenient." However, some ambivalent and negative perceptions, such as "nothing," "unknown," "dunno," and "unnecessary," were also noted. Structural topic modeling identified 5 main response topics: safety, empowerment, convenience/reliability, peace of mind, and concerns/uncertainties. The empowerment offered by LA-PrEP was the most prominent topic, representing one third (28.1%) of the responses, followed by safety (21%), convenience and reliability (16%), and peace of mind (15%), while concerns/uncertainties made up 20%. Variation in the relevance of these topics was found, showing LA-PrEP being seen as more empowering (=.070, 95% CI 0.042-0.097) and convenient (=.057, 95% CI 0.034-0.081) by current oral PrEP users, but less empowering (=-.052, 95% CI -0.087 to 0.017) and convenient (=-.034, 95% CI -0.064 to 0.005) for individuals in countries with limited oral PrEP access and affordability. The topic of safety was more relevant among those with lower levels of education (=.052, 95% CI 0.022-0.083) and those living in a country where PrEP was not reimbursed (=.035, 95% CI 0.002-0.069), but less relevant among current oral PrEP users (=-.094, 95% CI -0.12 to 0.066). We also found that ambivalent and negative perceptions were less relevant among current oral PrEP users (=-.032, 95% CI -0.056 to 0.007) and were negatively associated with a lower intention to use LA-PrEP (=-.075, 95% CI -0.101 to 0.005).ConclusionsOur research showed that MSM and trans* individuals in Europe generally have a positive outlook on LA-PrEP, suggesting it is likely to be well accepted upon its introduction in Europe. However, a subset of the target population may be hesitant to adopt LA-PrEP, underscoring the need for alternative HIV prevention strategies tailored to these individuals. To support potential future LA-PrEP implementation in Europe and to maximize its impact, appropriate communication strategies are essential for supporting informed decision-making.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 40938647 · DOI · PMC12475884

Exploring the Interest and Intention to Use Long-Acting Injectable PrEP (LAI-PrEP) Among Gay, Bisexual and Other Men Who Have Sex with Men (GBMSM) in the Netherlands [3]

Research article Kolstee J, Wang H, Zimmermann H, Schroeder M, Appiah A, Sarkar S, et al. · · 2026 · cited 4 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
Long-acting injectable PrEP (LAI-PrEP) provides opportunities to expand HIV prevention coverage in the Netherlands.
Closing excerpt
Sexually active Dutch GBMSM, who are already protecting themselves, may be the first group to use LAI-PrEP.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (247 words)

Long-acting injectable PrEP (LAI-PrEP) provides opportunities to expand HIV prevention coverage in the Netherlands. Understanding which Dutch gay, bisexual and other men who have sex with men (GBMSM) are interested in using LAI-PrEP when available can support HIV prevention efforts. Survey data was collected online via the PROTECT survey from 1,447 GBMSM in the Netherlands between October 2023 and March 2024. Multivariable logistic analysis was conducted to determine variables associated with GBMSM who intend to use LAI-PrEP when available. Interest and intention to use LAI-PrEP among Dutch GBMSM is high (76.1% and 73.9%) and among those currently on oral PrEP even higher (80.8% and 79.5%). GBMSM who intend to use LAI-PrEP have more sexual partners in the past 6 months (11-50 partners (aOR = 3.24; 95%CI: 1.54-6.85), 51-100 partners (aOR = 3.10; 95% CI: 1.20 to 8.30), more than 150 partners (aOR = 3.86; 95% CI: 1.74 to 8.67)), engage more in chemsex (aOR = 1.41; 95% CI: 1.00 to 2.01), are less likely to fear LAI-PrEP side effects (aOR = 0.83; 95% CI: 0.74 to 0.94;) or injection pain (aOR = 0.68; 95% CI: 0.61 to 0.75) and more likely to believe they are at risk of acquiring HIV (aOR = 1.23; 95% CI: 1.05 to 1.45). If made available in the Netherlands, many GBMSM are likely to commence using LAI-PrEP, particularly current oral PrEP users or discontinued users. Sexually active Dutch GBMSM, who are already protecting themselves, may be the first group to use LAI-PrEP.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41579236 · DOI · PMC13400490

Key reviews and meta-analyses

The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.

  • Research article Sex differences in aggression between heterosexual partners: a meta-analytic review [4]
    Archer J · Psychol Bull · 2000 · cited 807 times (Europe PMC)
  • Research article Heterosexual risk of HIV-1 infection per sexual act: systematic review and meta-analysis of observational studies [5]
    Boily MC, Baggaley RF, Wang L, Masse B, White RG, Hayes RJ, et al. · Lancet Infect Dis · 2009 · cited 597 times (Europe PMC)
  • Research article Sexual orientation and adolescent substance use: a meta-analysis and methodological review [6]
    Marshal MP, Friedman MS, Stall R, King KM, Miles J, Gold MA, et al. · Addiction · 2008 · cited 591 times (Europe PMC)
  • Research article Minority stress and substance use in sexual minority adolescents: a meta-analysis [7]
    Goldbach JT, Tanner-Smith EE, Bagwell M, Dunlap S · Prev Sci · 2014 · cited 344 times (Europe PMC)
  • Research article Prevalence of Depression and Anxiety Among Bisexual People Compared to Gay, Lesbian, and Heterosexual Individuals:A Systematic Review and Meta-Analysis [8]
    Ross LE, Salway T, Tarasoff LA, MacKay JM, Hawkins BW, Fehr CP · J Sex Res · 2018 · cited 340 times (Europe PMC)
  • Research article Effects of Pre-exposure Prophylaxis for the Prevention of Human Immunodeficiency Virus Infection on Sexual Risk Behavior in Men Who Have Sex With Men: A Systematic Review and Meta-analysis [9]
    Traeger MW, Schroeder SE, Wright EJ, Hellard ME, Cornelisse VJ, Doyle JS, et al. · Clin Infect Dis · 2018 · cited 325 times (Europe PMC)

References

  1. Chen S, Yu FY, Fang Y, Yau J, Ng N, Zhang Q, et al.. Chatbot-Delivered Real-Time Support to Improve HIV Self-Testing Rates: A Randomized Clinical Trial. . 2025. PMID 41284298 · DOI · PMC12645333
  2. Wang H, Kolstee J, Martinez JC, van de Vijver D, Tosh J, Schroeder M, et al.. Perceptions of Long-Acting Injectable Pre-Exposure Prophylaxis Among Men Who Have Sex With Men and Transgender Individuals in Europe Using Structural Text Modeling Technique: Cross-Sectional Study. . 2025. PMID 40938647 · DOI · PMC12475884
  3. Kolstee J, Wang H, Zimmermann H, Schroeder M, Appiah A, Sarkar S, et al.. Exploring the Interest and Intention to Use Long-Acting Injectable PrEP (LAI-PrEP) Among Gay, Bisexual and Other Men Who Have Sex with Men (GBMSM) in the Netherlands. . 2026. PMID 41579236 · DOI · PMC13400490
  4. Archer J. Sex differences in aggression between heterosexual partners: a meta-analytic review. Psychol Bull. 2000. PMID 10989615 · DOI
  5. Boily MC, Baggaley RF, Wang L, Masse B, White RG, Hayes RJ, et al.. Heterosexual risk of HIV-1 infection per sexual act: systematic review and meta-analysis of observational studies. Lancet Infect Dis. 2009. PMID 19179227 · DOI · PMC4467783
  6. Marshal MP, Friedman MS, Stall R, King KM, Miles J, Gold MA, et al.. Sexual orientation and adolescent substance use: a meta-analysis and methodological review. Addiction. 2008. PMID 18339100 · DOI · PMC2680081
  7. Goldbach JT, Tanner-Smith EE, Bagwell M, Dunlap S. Minority stress and substance use in sexual minority adolescents: a meta-analysis. Prev Sci. 2014. PMID 23605479 · DOI
  8. Ross LE, Salway T, Tarasoff LA, MacKay JM, Hawkins BW, Fehr CP. Prevalence of Depression and Anxiety Among Bisexual People Compared to Gay, Lesbian, and Heterosexual Individuals:A Systematic Review and Meta-Analysis. J Sex Res. 2018. PMID 29099625 · DOI
  9. Traeger MW, Schroeder SE, Wright EJ, Hellard ME, Cornelisse VJ, Doyle JS, et al.. Effects of Pre-exposure Prophylaxis for the Prevention of Human Immunodeficiency Virus Infection on Sexual Risk Behavior in Men Who Have Sex With Men: A Systematic Review and Meta-analysis. Clin Infect Dis. 2018. PMID 29509889 · DOI

About this article

Sources
NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
Verification
Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
Review state
automated source verified; no human expert review has been recorded yet.
Version
1, last updated 2026-10-31.

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At a glance

54,442
PubMed records on this heading
24%
published since 2020
4,685
review articles
1,028
randomized trials
9
verified references below

Counts come from PubMed on 2026-10-31; they show how much has been written, not how strong the evidence is.

Related topics See all →

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