Atheists & Freethinkers: Should *ALL* types of behaviors between consenting adults be legal?

It's pretty obvious that some sexual practices (such as the things you've described) are done by people who are not completely 'compos mentis'. Where there's a clear imbalance of power (such as you describe, where a 60-something is brutalizing young girls in their late teens), then someone needs to step in. Sometimes people need protecting from themselves, because 'they know not what they do'. It's evident (to me, anyway) that some sexual behaviours are the result of underlying mental/emotional health problems. Seriously, what sane person wants to be hurt, abused, or maimed or do those things to others for a sexual thrill?