If you were born blind and deaf, the only good thing you could figure out to do is masterbate. But then, your family would stop you from doing it since you'd have no concept of not moaning or not doing it in front of other people. So all you would know about other people is that they often prevent you from doing things that feel good. So in a sense, we are all blind and deaf and masterbating. You know, when others like hold us back and stuff.