About this "The Simpsons" episode:

The Simpsons - Secrets of a Successful Marriage is the 22nd episode of season 5 and number 103 overall in the series.
Tired of being called "slow," Homer signs up to teach a class on keeping a successful marriage at a learning annex. He is an unsuccessful teacher and finds that the only way he can keep the class interested is to tell racy secrets about Marge and their bedroom antics. Marge soon gets fed up with Homer telling their secrets and kicks him out. Homer starts living in Bart's treehouse and becomes so lost without Marge that he begs her to take him back, and she eventually agrees.