The extent of overlapping sexual partnerships is central to the spread of sexually transmitted infections, and is consequently important for HIV among gay and bisexual men. Here we use sexual exclusivity to mean repeated sex with one partner only. Sexual non-exclusivity can include men with multiple regular partnerships and men with a singular regular partner and additional casual partners either independently or together. This Insight Blast reports on responses to questions about sexual exclusivity asked in Month 8 of the Sigma Panel, sent on 1st September 2011.
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