I find that most people I talk to that are against gay marriage fall into one of two catagories.
1. Very religous people
2. Ignorent pricks
The first one is understandable because for most people marriage is a religous and spiritual thing and being gay is against most religions which makes gay marriage wrong. As for the ignorent pricks. They seem to not like gay marriage because they just don't like gays because it's gross or something and they just plain hate them. They try to hide behind the religous stuff and say that is morally wrong but you can normally pick them out because they get really pissed off after like 30 seconds of discussion.

Me personally, I'm not gay. Gay sex is gross to me (unless it's two girls ). But I am still all for gay marriage. I personally believe that being gay is some sort of defect that they are born with (my own personal theory is that it is something programmed into every species to fight over population). With that said there is nothing that they can do about it and I think they should have the right to live their life as close to normal as they want. Most of them have the same desires as normal people do. Find someone to love, get married, start a family, be successful, etc. And prohibiting gay marriage kinda fawks them over. I think that calling it a "civil union" or something like that if they got all the rights just like a marriage is still not right. Just because they can't breed with their spouse doesn't mean it's not a marriage. The love and commitment is still there. I can't back this part up but I heard somewhere that gay couples are more likely to stay together than straight couples. There has also been no correlation between gay parents and their children growing up gay. Anyway, tha'ts my 2 cents...hope it helps you out.