Entirely for it. No reason at all that it should be a problem. The arguments about it traditionally being a ceremony between a man and a woman are ridiculous, there are many other traditions that have changed as we became less ignorant. Marriage is also traditionally a religious ceremony, but I very much doubt that the majority of people getting married today (in places like the UK, at least) are religious. If people dislike the idea of it because it's traditionally for different-sex couples, they obviously have a problem with gay people whether they'll admit it or not.
As for the matter of gay couples adopting children, I see no reason why there should be a problem for the child. I haven't studied psychology, so I'm not pretending I know all about it
, but when a child has two same-sex parents who love and care for it, it is surely better than a child who has had one of its parents abandon it at a young age, leaving it with either an all-male or all-female influence (which isn't exactly uncommon - especially here in chavland
). The child is going to experience hundreds of different people (as well as plenty of other couples, so it's not going to have the idea that same-sex couples are "the norm") as it grows up, so it'll have plenty of female figures in its life (neighbours, teachers, aunts, grandmas...)