I'll make this blunt: if you're a guy then half the population is not capable of 'enforcing their boundaries' against you, more so if you count children. The problem you seem to have is to think that if someone is not capable of enforcing their boundaries that they are not allowed to have those boundaries and that it is your god given right to do whatever the F* you want just because you can. That's not how the world works, nor is it how it should work.

Boundaries - of all kinds - are not unenforceable nonsense, they are rights that you willingly and knowingly violate.