Men who have sex with men (MSM) are a socially and culturally diverse group, some of whom may not self-indentify as 'gay'. MSM remain at greatest risk of acquiring HIV infection within the UK with no evidence of declining infections in this group.
Sexually Transmitted Infections and Men who have Sex with Men in the UK: 2011 Report
Men who have sex with men can reduce their risk of getting or transmitting HIV, or a sexually transmitted infection, by:
Unprotected sex with casual and new partners who are believed to be of the same HIV status (serosorting) is unsafe. For HIV positive men, serosorting poses a risk of acquiring other STIs and hepatitis with serious treatment implications. For HIV negative MSM it carries the risk of HIV transmission (as a quarter of HIV positive MSM are unaware of their infection), as well as acquiring STIs.