There are only 72 virgins, total. Paradise isn't all that big, y'know. All the martyrs have to stand in long lines in the hot sun and share the virgins. And as soon as they get in the virgin quarters and do their thing, the virgin says you got her pregnant and demands that you marry her. She wants your money and she wants to go shopping and she makes you move furniture and take out garbage and clean the garage and it goes on forever.
</tongue in cheek>