Bob joins a very exclusive nudist colony.
On his first day he takes off his clothes and starts wandering around.
A gorgeous petite blonde walks by him and the man immediately gets an erection. The woman notices his erection, comes over to him grinning sweetly and says, "Sir, did you call for me?"
Bob replies, "No, what do you mean?"
She says, "You must be new here; let me explain. It's a rule that if I give you an erection, it implies you called for me."
Smiling, she then leads him to the side of a pool, lays down, and happily lets him have his way with her.