Not sure where you got that there was a presupposition that gay men can't have sex with women. The question is do they. The answer is some do, some don't. Some gay men might not be capable of having sex with a woman. They might not be able to arise to the challenge and that wouldn't be unusual, but by no means does it mean all men.
I think DaddyD had it right that for many gay men of his generation, maybe most, had sex with women because they were either trying to like it like Brussel sprouts or they were trying to hide their sexuality. My sons generation, at least here in CA, doesn't need to conceal themselves in the same way. Will he have sex with a woman, has he had sex with a girl? I have no idea, but I do know is that if he does it will be because he wants to for his own reasons, not because he feels he has to.
What is poppycock is that "many of you <us> had fathers who were gay", but we or they didn't know it. The percent of men who are gay just isn't high enough for that to be true.
As to you Mark, it is a good question and I assume you are refering to Will since I think the question/challenge has been raised and Will loves a challenge (he is also 14, horny as hell and probably a bit curious). I hope he "closes the deal" or what ever phrase it was that Darius used. It seems most of the gay men around Will, JP, Brad, Robbie, Cody, Matt, Wade, etc have had sex with women. Stef is one of the few who I think never has.