No doubt if you spend all day masturbating and don't do anything else, then you've got a problem. If the rest of your life is in order and you spend thre rest of your time spanking your monkey, who cares?

Thinking that masturbating is "dirty" (not sure if that is what you meant) is to my mind a serious problem.

Maybe you spend so much time trying to get guys to stop masturbating because you personally think it is dirty, and not because it is really a problem.