Are you arguing that anything that is not explicitly prohibited is permitted?
I have absolutely no idea where you are going with this. But, do Catholics practice rhythm? Is this some kind of interference with the otherwise procreative work and trying to get pleasure without payment? Sorry, this is all for me on this weird topic.
If you cut off your hand, you’d call that mutilation, right?
Mutilation means to perform surgery on a part of the body in order to destroy the healthy function of the body.
The healthy function of the body is to be fertile. Tubal litigation and vasectomies are mutilation, because they destroy the healthy function of your body in order to render yourself infertile.