Also, there's an interesting research that says that girls that have painful periods or "endometriosis" tend to be "hotter"...(Which I think is bullsh*t because I know a lot of fat or average looking girls with painful periods)...
here's an article from Jezebel...
link
yeah, same thing I've noticed...i've had a few instances when my periods were excruciating, but that was when I was heavier, but since I'm close to being of normal/underweight, it's not as bad.