Lesson 1:
A man is getting into the shower just as his wife is finishing up her shower, when the doorbell rings.
The wife quickly wraps herself in a towel and runs downstairs.
When she opens the door, there stands Bob, the next-door neighbor.
Before she says a word, Bob says, 'I'll give you $800 to drop that towel.'
After thinking for a moment, the woman drops her towel and stands naked in front of Bob, after a few seconds, Bob hands her $800 and leaves.