I don't understand why Japanese authors are so fixated on this topic and so consistently wrong. Simply having a foreskin is not in any way the same as having phimosis. If you never learned to pull back your foreskin properly to wash everything in there, well... First, ew. That nasty. You nasty. Second, start doing it! Act like a big boy and clean your bits. Unless they have an extremely specific fetish, ain't nobody wanna get with your unhygienic junk.