Yes for Both
For marriage I don't see any reason as to why to gay people shouldn't be allowed to get married. Being gay isn't really a choice I think. I believe your born attracted to a certain sex, and your ability to marry shouldn't be taken just because your not attracted to the opposite sex.
I say yes to adoption because I don't think it should matter who raises you whether they're a man and woman, or two of either. As long as they're people who are smart and responsible enough to raise a child, I see no problem with it.