In one report published in NEJM it was about 40% that were HIV positive. Note that this was in the beginning of the epidemic - about 600 patients reported on.
https://www.nejm.org/doi/full/10.1056/NEJMoa2207323?emp=marcom&cid=DM1289135_Notable_Articles_Engaged&bid=1085207852
I assume at least 40% of homosexuals are HIV+.