[consumer451]

Anecdote: I just want to add that if you spend a decent amount of time with groups of dogs, you will find female dogs mounting and thrusting on male dogs very commonly.

To me, this is evidence that non-heterosexual behavior occurs in mammals other than humans. Therefore it is not only a human social construct. BTW, even if it was just a human social construct I don't know why I should have a problem with that.

Edit after 1 upvote, apologies.

To be 100% honest, this was an evolution of thought for me. Seeing 2 guys making out freaked me out the first time I saw it. These days I have all kinds of non-hetero friends and their behavior does not freak me out.

I wanted to add this because so many of these conversations lack depth and understanding.