These are all regularly espoused reasons, but compared to the article in question they seem rather weak. Some of the tone in your comment seems to suggest that

These are all regularly espoused reasons, but compared to the article in question they seem rather weak. Some of the tone in your comment seems to suggest that I'm making a political argument. Let me be very clear here and now that I am not. Nothing I say here insinuates morality of any form. I'm simply trying to understand why. I get the bi-sexuality aspect of this, but homosexuality is much more than simply not being selective in who you have sex with. There are significant traits and brain changes in people that identify as homosexual that shouldn't be present if all homosexuality is simply the result of permissiveness in our ancestors. While the effects of evolution can be observed on a macro scale, they are always the result of selfish genes. In other words, I'm not sure I completely buy the idea of kin selection, especially with humans. That being said it's not something I've deeply versed in.