I'm familiar. What does that have to do with putting defined personal restriction on liberty. In this instance; what someone is allowed to do with their own body?
You mean things like selling ones own organs, or suicide, or adultery, or pedophilia (if a child wants to have sex with an adult), or beastiality, or prostitution, or ....
Well, I think you should get the point by now.
Societies around the world have ALWAYS restricted private personal behavior that only affects consenting individuals.
It is part of something that we call civilization.
If I want to sell a kidney or commit suicide what business is it of yours? Adultery is between me and my wife. Prostitution is not really your business either unless you are the prostitute or patron.
The bestiality and pedophilia arguments are just ridiculous. No one is suggesting that the law allow innocents be harmed regardless of whether they think they want to or not. There should be an established age of consent and if you violate that you should face the consequences. The key phrase to remember is "Consenting Adults".
Bestiality? Really?