Well, they are people, they just think differently. Besides, the government of Canada allowed gay marriage, and now so does California's. It would be about how humans are in general. Humans and dolphins are some of the smartest animals on the planet. And being smart, that means that both humans and dolphins are able to do it for fun, instead of what other animals do it for, which is purely for offspring. This can also create gays in the species, and believe it or not, there can be gay dolphins out there. It's only because we humans are too smart and are able to think deeper thoughts. As for the theory of "gay at birth", scientists still haven't proven anything about that, so while you wait, you might as well read I Am America(And So Can You!), in chapter 7, which is the homosexuals part.