title: Age and Age Discordance Associations with Condomless Sex Among Men Who Have Sex with Men.
abstract: We explored the effect of older partner's age and age difference between partners on condomless sex among men who have sex with men (MSM). We analyzed dyads (n = 1720) from participants (n = 969) in the Sexual Acquisition Transmission of HIV Cooperative Agreement Program. We used modified Poisson regression to model the probability of a sexual encounter's being condomless as a function of older partner's age and age difference between partners adjusting for HIV status, substance use, race/ethnicity, and partner type. We found an interaction between older partner's age and age difference (p < 0.05). Condomless sex decreased with increasing age of the older partner when the age difference was 5-9 years (p = 0.004) or ≥10 years (p = 0.04), but not when <5 years. Condomless sex was less likely among older MSM when there was ≥5 years age difference between partners than <5 years difference. Both age and age discordance affect the likelihood of a sexual encounter between MSM being condomless.
authors.affiliation: Psychiatry and Human Behavior, Charles R. Drew University of Medicine and Science, 1731 E. 120th St., Building N, Los Angeles, CA, 90059, USA. HomerodelPino@cdrewu.edu.|Psychiatry and Biobehavioral Sciences, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA. HomerodelPino@cdrewu.edu.
authors.forename: Homero E
authors.identifier: 0000-0002-5702-0251
authors.initials: HE
authors.lastname: Del Pino
authors.affiliation: Psychiatry and Human Behavior, Charles R. Drew University of Medicine and Science, 1731 E. 120th St., Building N, Los Angeles, CA, 90059, USA.|General Internal Medicine and Health Services Research, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA.
authors.forename: Nina T
authors.initials: NT
authors.lastname: Harawa
authors.affiliation: Department of Medicine-Geriatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA.
authors.forename: Diana
authors.initials: D
authors.lastname: Liao
authors.affiliation: Department of Medicine-Geriatrics, UC San Diego School of Medicine, La Jolla, CA, USA.
authors.forename: Alison A
authors.initials: AA
authors.lastname: Moore
authors.affiliation: Department of Medicine-Geriatrics, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA.
authors.forename: Arun S
authors.initials: AS
authors.lastname: Karlamangla
mesh_terms: D000328:Adult; D000367:Age Factors; D017280:Condoms; D003430:Cross-Sectional Studies; D018451:Homosexuality, Male; D006801:Humans; D008297:Male; D008875:Middle Aged; D012309:Risk-Taking; D012725:Sexual Behavior; D012747:Sexual Partners; D014481:United States; D047568:Unsafe Sex / Q000706:statistics & numerical data*
keywords: Age discordance; Condomless sex; HIV; Men who have sex with men; Substance use