An argument for the pro-gay side

From the book Sex at Dawn:

pg. 78: [comparing humans with chimps and bonobos] There is a high degree of variability in potential sexual combinations in humans and bonobos; homosexual activity is common in both, but rare in chimps. [Bonobos are the only primate besides us that has sex for reasons other than reproduction.]
....
pg. 103: Recognized as a way to build and maintain a network of mutually beneficial relationships, nonreproductive sex no longer requires special explanations. Homosexuality, for example, becomes far less confusing, in that is is, as E. O. Wilson has written, "above all a form of bonding . . . consistent with the greater part of heterosexual behavior as a device that cements relationships."

In other words, homosexuality is not only 100% natural, it likely evolved because it was a benefit to society.

And ladies, there's evidence that we might all be a little bit gay.