A woman invites a man back to her apartment one evening. As they enter, she immediately suggests they try "69."
"What's that?" he asks, confused.
Realizing his inexperience, she explains, "I put my head between your legs, and you put your head between mine."
Still unclear but not wanting to spoil the mood, he agrees. The moment they assume the position, she lets out a loud fart.
"What was that?" he asks.
"Oops! Sorry, let's try again," she says.
They resume the position, and she does it again. The man gets up and starts putting on his coat.
"Wait, where are you going?" she asks.
The man replies, "If you think I'm staying for 67 more of those, you're crazy!"