I'm not opposed to gay marriage - their marriage doesn't hurt me or society. But I am opposed to gay couples adopting or having their own children. I can bend on adoption but procreation is a contradiction to their lifestyle.

Um. Being gay doesn't render anyone infertile. And I don't see what the point is in pretending that it does, just because same sex relationships aren't procreative in and of themselves. You aren't as opposed to adoption so I'm trying to understand your thinking here. Do you theoretically propose to limit procreation to only those who are engaged in longterm heterosexual relationships? Or only to those who actually enjoy the heterosexual sex act (ie., straight people)? How would that work?

Leaving out of course bisexual persons, and the many gay people who don't realize they are gay until well after having engaged in longterm heterosexual relationships and having children... why in the world should you object to any person using their own reproductive organs to reproduce?

How many straight people do you know who have no business having kids, but keep on having them anyway? Does their being heterosexual have anything to do with their being unfit parents? Or is there sexuality simply incidental to their crappiness as human beings all around?

Gays are no different. Some of them will be shitty spouses, parents, citizens etc... at the same incidence rate as the straight population. Sexual oritentation has nothing to do with it.