A fellow talking to his friend says, “How can I know that my girl is a virgin ?”
Friend tells him, “You have to wait till your wedding night, you show it to her and ask what is it. If she calls it a penis, she’s a virgin. If she says it’s a cock, she’s been around.”
So the guy gets married, and in the hotel room he flips it out to her and says “What is this?”
“That’s a penis!” she replies.
“Great,” he sighs, “I thought you were going to call it a cock.”
“Of course not! A cock is twice as big!!”