Some UK stats.
(Our situation is different because we have immigrants from Africa where it infects more heterosexuals than in western countries.)

Although only about 1% of the total population of Britain are adult gay men, almost half of the people living with HIV are gay men.

This means gay men are about 90 times more likely to be living with HIV than other people.

Similarly, although African people account for about 1% of the population in Britain, 33% of the people living with HIV are African.

This means African people in Britain are about 50 times more likely to be living with HIV than other ethnic groups.
http://news.bbc.co.uk/1/hi/health/3856963.stm

(Without the African dimension, gay men would account for rather more than the 53% quoted for USA)