To be fair, they're nothing if not consistent in this view, because they think straight relationships are just about sex as well:

Why do you think they always seperate boys and girls? They think they're gonna fuck if they're left alone unsupervised.

What is the purpose of marriage to them? To have children. Which is just a really elaborate breeding kink. It's about sex.

Why do you think the concept of a man and a woman just being friends is so damn alien to them? Because it's all. About. Sex. They can't fathome the notion that two people of the opposite sex won't tear off their clothes and fuck like animals the moment they're alone in a room together.

Bigots are the most sex-obsessed people on this planet! And it shows in their actions and their rhetoric.