One of the dumbest of the very dumb anti-gay marriage arguments is the one that asks if everyone was gay. See, the logic is that if everyone was gay then we as a species would not reproduce and we would all die out. Well, that isn't true, because my father was gay. He seemed to have reproduced.
Anyway, there is no chance that everyone will be gay, just as there is no chance that everyone will be a Catholic priest, because if everyone was a Catholic priest there wouldn't be re-production. Also, if everyone was a doctor there would be no food grown, so everyone would starve. Or, conversely, if everyone was a farmer there would be no doctors to cure an illness. So, you can see how silly this argument becomes.
Well, this video explores the idea if being gay was the norm and heterosexuality was considered a perversion. It captures perfectly the attitudes and bigotry and hatred that many on the Christian right-wing express against those who are gay. They would deny they are like the characters on this video, but it captures perfectly their fears.