I honestly don't really care when it comes to legally being married, because if they want to, who gives a fuck, just as long as it doesn't force be into shit that is against my morals / ethics.. I mean, one of my friends has 2 fathers, and i feel it has majorly affected his life, because he gets made fun of at school 'HAHA FUCK YOU YOUR DADS MAKE SEX IN THA BED' Then we all have to kick that person's ass, but seriously ruins the kid's teenage life pretty much. People shouldn't have to go through that just because their parents are gay. Maybe if the whole world kind of dropped racism, and predijuceness (<- not a word i know) , and didn't give a fuck, fine. But it's sad for the kids.
It's not the parent's fault that his kid is made fun of.. He should be proud, whether he has 2 dads, 2 moms, or whatever combination. If, as you said, everyone dropped prejudices, the world and those kids wouldn't have to go through with it.