If I knew who Dan Savage was I'd say congratulations.
There is nothing biologically normal with marriage.
No reason for there to have been selection away from any gay sex; evolution only cares about stuff that has bearing on your survival, and being gay at camp doesn't meet that criteria. The people making evolutional arguments usually try to say that exclusively gay people are an anomaly because they don't advance the species. Problem is, apparently the "gay gene," whatever/wherever it is, evolved in tandem with whatever genetic string helps us produce insulin. So it's as "natural" a part of the human genome as anything else is--and yes, advances the species. There are other theories that stand next to this one--the "gay uncle" theory, which works with the "grandmother" thing, and regards the role caretakers took in advancing the species--but that's the one that most closely ties gayness to biological necessity.
