Is homosexuality a genetic glitch?

Sorry if this offends anyone but I’ve thought about this long and hard for a while. Now that we’ve acknowledged that homosexuality is not a choice I think it’s time to examine its origins/cause to better understand it.

Let’s start with the basics - sexuality, sexual intercourse and sexual attraction all exist for one purpose and one purpose only: procreation; to ensure the survival of a species. This is no different in humans than it is in fish or birds. We can then conclude from this that any deviation from heterosexual attraction, be it homosexuality, bisexuality, or even asexuality, is not natural as none of them can produce an offspring. People saying that sexual reproduction is NOT the only purpose of sexual intercourse, who then proceed to rattle off all of the social and emotional health benefits of sexuality are wrong.

It doesn’t matter that homosexuality has existed since the beginning of time, or that it is pervasive across all different families in the animal kingdom, naturally occurring glitches that appear consistently on the evolutionary timeline does not make them “natural” in the sense of being intended.