You are a human being, right? Every part of your body is sacred. By which I mean at the least (lest you misunderstand): To be treated with reasonable ethics and due respect. Not to be treated as trash. Cf. imago Dei..
For instance,it would be a sin with direct nontherapeutic intent to disable the prefrontal lobe of your brain, maim your genitals, remove a normal eye or an ear for sheer preference, or intentionally (intentionally) put your sperm anywhere but in your wife's genital tract.
This "up the butt, down the throat or into the throwaway baggie" stuff shows contempt. No wonder why people first desacralize, then depersonalize, finally dehumanize their sexuality, and call their generative organs "junk".
And yet...
Ham saw his father naked; but C anaan was cursed.
Strange.
HMMMmmm...