Being gay or wanting to be a parent are two different things. People don't chose to be parents simply because they are heterosexual any more than people choose to be gay because they don't want to be parents. Of course, that said, most people don't "choose" their sexual orientation either. In these modern times, sex and child bearing are two exclusive things, and don't really have to have too much to do with eachother. If a woman finds the thought of having sex with a man horrific, but still wants to a birth child, it is entirely possible for that to happen without actual sexual penetration with a penis. Of course, a man in the same situation would have a more difficult time, but I guess that's what surrogates and turkey basters are for.
I do believe there is a certian percentage of the human populaton that has the drive to procreate, as well as a percentage of the human population that has no urge to procreate, but that has no bearing on the orentation of those people. I know many gay people who are, or want to involve themselves in, parenting. That said, I find that more gay people than not dislike children and have no desire to raise any. I think, however, it's more 'socially acceptable' for a gay person to express distain for children, after all they can't make any naturally (yeah, that doesn't really make logical sense, but when has society been logical?)
About our "Defense of Marriage" bullshit...if passed, it will actualy legislate discrimination against anyone who is in a "non married" union, heterosexual or homosexual. At least in the city I live in, I believe it is possible for non married, heterosexual people to also enter into a civil union, and receive the same benefits and protections as married people. I know that the people against this tend to go on and on about the affect it would have on children, but you know our pro-natalist society...if it isn't about The Children, it's too complicated to explain or think about. They actually do have an ad out that explains how this law will affect people beyond The Children, in that it will disallow all sorts of "rights" legally married couples take for granted.
"It truly is the one commonality that every designation of humans you can think of has, there's at least one asshole."
--Me