I've had a couple of chicks I've seen in the past that didn't mind fucking on their period, and they would stop me from eating them out if I was licking or kissing down below the belly button. I've had other bitches refuse to fuck, and wouldn't attempt to satisfy me in some other way either. I can't imagine eating a chick out on her period on purpose.
"The best kind of pride is that which compels a man to do his best when no one is watching."