I have no problem if a pc wants to deal damage to herself. I DO have a problem if she derives any benefit from that action, though.EDIT and @jhaelen, there's a significant difference between "you take damage" (which you can easily cause, you can deal damage to yourself) and "you are attacked/hit by an attack". Not that that's likely to change your mind, but it is still relevant.
Despite what some people may think D&D is not a S&M game
