I have to say, even if these studies have truth to them, you can't really take this is valid condemnation of any inherent nature of homosexuals.
Perosnally, I find it hard to believe simply based on my own surrounding community and what I see in both gay and straight people around me.
But moving on, I've thought about the issue of promiscuity and a certain prejudice that homosexuals treat sex with no sense of sanctity. There are certainly a lot of different opinions within the gay community about sex just as there are promiscuous people and non-promiscuous people in the straight population.
I was thinking about why promiscuity in the gay population could be higher, and two ideas came to me. The first is pretty simple, and not actually as important as the second. So, you have the fact that males think more about sex than women, or in other words, basically guys are hornier. I mean, that's pretty much the whole point right there, you can probobly infer where I'm going with this. It's not really reasonable to conclude that there's something inherent about homosexuality that makes them more promiscuous when you've got the considerably more simple explanation that they're both guys, and guys just can't keep sex off the mind.
But my second idea, and I think that this one was much more significant, is that society doesn't teach homosexuals about relationships. Heterosexuality is EVERYWHERE in our society, in love songs, movies, books, television, and rightly so, because not only are most people straight, but love and human sexuality is a wonderful thing IMO. But when it comes to homosexual youth, not only do they see no examples of dating, courtship, relationships, etc, that they can identify with, but there's ALSO the closet to deal with. Society, for the most part, shuns them, and they have to hide who they are.
So to sum that up, not only do homosexuals have no image of relationships to learn from, but the one thing that they do learn is that what they are is bad and they need to hide it.
That's not a healthy environment for relationships. That's an environment that encourages promiscuity.