Amsterdam 2015
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| Abstract #3452 - Why do I do what I do? Motivational determinants of risk taking | ||||
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Session: 18.6: Why do I do what I do? Motivational determinants of risk taking (Symposium) on Wednesday @ 14.30-16.00 in C202 Chaired by Maria Koulentianou, Joseph Lau Authors: Presenting Author: Mr Wijnand Van Den Boom - Public Health Service Amsterdam, Netherlands |
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| Aim: To determine the prevalence of group sex among HIV-negative men who have sex with men (MSM) over a 3-year period 񢉙-2012) and to investigate whether group sex is associated with lower use of condoms during anal sex and higher prevalence of STI compared to dyadic sex. | ||||
| Method / Issue: Cross-sectional data from 7 data waves of the Amsterdam Cohort Studies (ACS) were used. The study sample consisted of MSM (n=465 median age=36 [IQR=32-41]) who, in the preceding 6 months, had reported both group and dyadic sex (at n=706 visits) and who had reported only dyadic sex (at n=1339 visits). Logistic regression with generalized estimating equations (GEE) was used to investigate the association between sexual context, condomless sex and STI. | ||||
| Results / Comments: At 35% 鼂/2045) of the visits participants reported group sex during the study period. Condomless sex was less frequently reported during group sex than during dyadic sex, OR=0.3 ࿿%CI=0.2-0.4). No statistically significant difference in condomless sex was found during dyadic sex for men who do or do not also report group sex , p=0.1. Men who had group sex were more likely to be diagnosed with any STI than men who had dyadic sex, OR=1.2 ࿿%CI=0.8-1.7), although this difference was not statistically significant. However, men who had engaged in group sex were more likely to be diagnosed with Gonorrhea compared to men who had dyadic sex, OR=1.7 ࿿%CI=1.1-2.7), but this effect was not retained in the multivariate model. | ||||
| Discussion: Our results demonstrate within-person differences in sexual behaviour between group sex and dyadic sex among MSM. As men were less likely to engage in condomless anal sex during group sex, group sex might not necessarily be a context that poses an increased risk for HIV infection compared to dyadic sex. However, group sex encounters might be higher-risk contexts for the acquisition STI other than HIV, such as Gonorrhoea. This apparent discrepancy could be explained by the fact that other sex techniques than anal sex (e.g., fingering) contribute to the spread of STI during group sex encounters. Our data suggest that a group sex encounter should be recognised as a distinct sexual context which has its specific risk characteristics that need to be addressed accordingly. | ||||
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