So you don't mind people jerking off whilst you're trying to enjoy a coffee and a cake or get a book in the library with your kids?
I mind, call that absurd if you like.
It's not nudity that is the problem in public spaces like libraries it's use of pornography. A simple way to avoid most masturbatory use of such spaces is to prevent people from being able to view pictures of other people who are naked.
Even if it were prudishness, then what right do you have to dictate to the "prudish" what their attitude to nudity or sexual imagery in public spaces should be?