Literally forever for hominids. There are studies to back me, but I think gay people are an evolutionary advantage. Really weird that people think “it’s not natural”.

Gay men are an obvious advantage to the tribe. They get a body with the strength and endurance of a man, but who won’t add the burden of a child. Gay women, much the same deal. You get a nurturing member, who as a major bonus can lactate if need be, no baby burden. Gay are force multipliers!