I've heard the "lack of male role model" argument a lot, and so far I agree with SuperBowser. I think that for some gay males, they can't identify with traditional male role models because they are gay. If you're a guy with feminine traits or interests, the traditional concept of masculinity probably doesn't appeal to you (well, not the way society wants it to, anyway). If you're a masculine guy who is gay, you might still have male role models, but you won't be able to look to those role models for guidance in sexual matters.
But that seems like drawing an improbable conclusion due to prior bias. It also doesn't account for the fact that most homosexuals dislike the other sex.
I'd like to see the source of that information. "Most" is too general, and "dislike" is also a suspicious word.
Also, assuming that source is 100% accurate, psychological characteristics aren't causation either. Children are short because they are children, but that shortness isn't what makes them children.
I think neglect or lack of a male role model could mean the child fails to develop masculine traits, and as a result adopts more from the female role model, including sexuality. Just a theory though.
Then we'd expect to see a higher rate of male homosexuality among guys who were raised by single mothers. However, a lot of the time, guys who don't have fathers growing up will seek out male role models outside the immediate family, either a male relative, a family friend, a sports coach, sometimes a gang leader, or even just a sports celebrity that they admire. I think the lack of a male role model probably leads more guys to join gangs and get into trouble rather than turn gay.
There are also male homosexuals who are extremely masculine, who look up to male role models, and who may or may not have had father figures while growing up.
Plus, you don't want to confuse male homosexuality with transgenderism. Transgenderism doesn't necessarily imply one orientation over another.
Judging by this thread, nobody has a problem with lesbians. Lolz.