I was just walking back to the office with two of my male co-workers. As we passed the ladies toilets one of them 'checked out' a woman as she went in. He was promptly chastised:
"You just broke the golden rule, never check out a girl when she's going into the loos."
"Why?" replied my other co-worker (and I wondered too, was it some kind of chivalry perhaps?)
"Cos you know she's full of piss."