Transactional sex among men who have sex with men participating in the CohMSM prospective cohort study in West Africa

Men who have sex with men (MSM) are at much greater risk of HIV infection in Africa. Little is known about their involvement in transactional sex (TS). We aimed to characterize MSM reporting TS (MSM-TS) and to identify factors associated with their sexual practices using data from the prospective cohort study CohMSM conducted in Burkina Faso, Cote d’Ivoire, Mali and Togo. Our study focused on HIV-negative MSM, recruited between 06/2015 and 01/2018 by a team of trained peer educators. Scheduled study visits at 6, 12 and 18 months included medical examinations, HIV screening, risk-reduction counselling and face-to-face interviews to collect information on their sociodemographic characteristics, sexual behaviours, and HIV risk-reduction strategies. Three stigmatization sub-scores were constructed. The generalized estimating equation method was used for data analysis. Of the 630 HIV-negative participants recruited at baseline, 463, 410 and 244 had a follow-up visit at 6- and 12- and 18-months, respectively. Over a total of 1747 visits, 478 TS encounters were reported by 289 MSM-TS (45.9%). Of the latter, 91 participants reported systematic TS (31.5%), 55 (19.0 %) stopped reporting TS after baseline, and 53 (18.3%) reported TS after baseline. Ninety participants (31.1 %) reported occasional TS. After adjusting for country of study and follow-up visits, the following factors, reported for the previous 6 months, were associated with a greater likelihood of TS: younger age, an educational level