Blondes dumb?!?!?

 After many hours of extremely acrobatic and exhausting sex with a
blonde he had just picked up, a man goes into the kitchen for some food
to replenish his justspent energy. He pours himself a glass of milk
and right before drinking it, he realizes his manhood is still pretty
hot,so he sticks it in the glass to cool it off. Just then the blonde
walks in and says, "Oh, I always wondered how you refilled those."