Yes, using pleasure as the only reason is absolutely wrong.
No problem answering ANY of your questions.
Remember the rule of one point of argument at one time.
Just agree that using pleasure as the sole reason to make something legit will mean Bestiality and pedophilia and ribber doll sex are also acceptable acts.
I dare you.
P.S You lost the first test of anatomy big time.. by the way.
And losing another one so far by going tangential.