I don't recall the verse where it says that. I think that is just an interpretation of smiting sadom & gamora for their wicked ways. Do not rape these strange men, instead take my daughters, said Lot, the pios man from there.

Sounds like a book for children

I think it's all about poop involved in the sexual act and it reminds us that we are animals. Some people go as far as wanting breastfeeding banned because they find our animal nature disgusting.

Unnatural? Yeah, right. Take a walk and observe nature. Study giraffes (fun fact, most giraffe sex is male on male). Note there are lizard and snake species that are all female (And in at least one, they stimulate one another to bring on reproduction).