There can be no debate without at least 2 sides talking, and we've all heard plenty of the media's side on this one. So here is an excellent analysis of the other side of the homosexual marriage debate. Not the "it's not fair that you can express your love and I can't express mine" side, but the "marriage shouldn't be messed with" side--and, lo and behold, there are good reasons. Logical reasons, not entirely based on religious doctrine reasons.
Read here: http://newsroom.lds.org/ldsnewsroom/eng/commentary/the-divine-institution-of-marriage