And now for something completely different...
I only have anecdotal information; years ago I was watching an episode of a tv drama about homosexual people called 'Queer as Folk' (both male and female, but the central characters were male), and an older gay man in the room with me commented that the show depicted (for him) a very accurate portrayal of what it is like to be a young, homosexual man - in regards to promiscuity and multiple partners.
I have nothing against any of this, none at all. However, it would seem to me that the more partners a person has, the higher the probability of contracting a sexually transmitted disease.
But if everyone is a willing partner, and all parties are informed, then I can't condone it. Also, I am of course aware that heterosexual people can spread themselves around just as much.
Really, I can't find fault with homosexuality at all. Dunno why I just posted all that... Oh well, that's my two cents.