As a bisexual, I am definitely pro-gay/lez. Gays should be allowed to adopt children, live peacefully, and be able to walk hand in hand down the street without some redneck throwing stuff at them while shouting "******!!".
As for the issue of marriage, I personally believe that marriage should not exist. I don't believe you need to have a ridiculous, costly ritual just so you can spent your life with your partner.
While I believe that reproduction is natural and neccesary, I do not believe that you need to reproduce in order to be "normal". How is being gay and thus not reproducing any different from the thousands of mothers who refuse to have children? Plus, it's perfectly possible to get a gay man to reproduce with a woman.
Also, I'm with Abnegation in the fact that it's impossible to be 100% gay or straight.