You have to resort to ad hominems and emotional arguments because you're grasping at straws
Promiscuity is far more prevalent in the homosexual community and within their relationships than heterosexual relationships as a % of population. Sexual compulsion among gay men is unusually high as well.
Big spike in cases of syphilis in S.F. / Gay, bisexual men affected most - SFGate
Secondly, the weakness of individual people does not tarnish the credibility of the institution. Marriage is one of the oldest institutions of the human race, with specific social and economic purposes. Gay "Marriage" doesn't fit into the institution anymore than I would fit in at all an all female fitness club as a male, or that woman marrying a roller coaster does. Any marriage other than man + woman is not real marriage. They are pretend marriages. Homosexuals are defined by their sexual behavior while heterosexuals are defined by their roles as parents. Biologically it's irrefutable. Children do best when raised by their biological parents in a low conflict household. I find it ironic that you're projecting that other people have "childlike views on marriage" when the notion of "Gay Marriage" is about as childlike a want as there could be. Wanting Gay Marriage is an emotional and selfish need, with no respect for the institution, much like how a when a 5 year old wants something, he just "wants it", regardless.
Gay "Marriage" isn't real marriage
It's pretend marriage