And orgasms! Don't forget orgasms. They are the absolute best, most effective, surefire cure for menstrual cramps in the world. (HER orgasms, not HIS, gentlemen. Sorry.)
Side Note: Although having someone else induce said orgasms is clearly the preferred method, it is by no means the only way to go (so to speak.) If your mate is frightened by the "black widow" possibilities should his most valiant attempts fail, you might choose to be understanding and gentle with him...then lock him out of the bedroom and cure yourself.