Also interesting:
The pain associated with menstrual cramps can be relieved by reaching orgasm (her, not you, doofus).
I know, I know: it sounds gross. However, if you're skilled at getting her off through clitoral stimulation by hand, it's really not gross at all...you don't even have to get near the troubled area.
If your girlfriend/spouse/SO/neighbor suffers from intense cramps, offer her this solution next time. If you do succeed in easing her pain, she'll be immensely grateful.
I'm sure you'll be able to think of some way for her to express her gratitude.