Your dumbass ancestors might have agued gay people denied reality. Penises go in vaginas and all that. Procreation, without it, the species dies. All biological fact, also utter nonsense.
People "transform their bodies" literally all the time.
You're specifically drawing the line at genitals for no reason whatsoever, even though it's societally acceptable for women to mutilate their breasts with augmentation surgery.
People don't have artwork on their skin unless they "transform their bodies". People don't have filled in lips, dyed hair, steroid or supplement-enhanced bodies unless they "transform their bodies".
It's a shit argument.
Do better.