You know the pain is part of the whole thing. And it isn’t that you can say afterwards the pleasure was greater than the pain and that’s why you would do it again. That has nothing to do with it. You can’t measure it, because the pain comes after and it lasts longer. So the question really is, Why doesn’t that pain make you say, I won’t do it again? When the pain is so bad that you have to say that, but you don’t.