Not to be gross here but I think a lot of this is lost in conversation because people shy away from the particulars. Vaginal and oral sex are rather ineffective at spreading HIV. There has been a rise in recent decades of HIV in African American women in particular, however it is known that this is due to an increase in that population of unprotected anal sex with a larger number of partners than previously. If they did this simply because they hate gay people why did they not include lesbian women?

I'd say a better policy would be excluding those who engage in nonmonogamous anal sex more generally, however I don't think the public has an appetite for that discussion.