Season 5: Episode 83: Prick Up Your Ears

Lois discovers that Chris has some bad information about sex and she volunteers to teach a sex-ed class at the high school. Some parents become upset with her brutal honesty, and they have her replaced. A conservative christian comes to Quahog and gets rid of the condoms at James Woods High. As a result the kids find an interesting loophole. Meanwhile Stewie, terrified of the Tooth Fairy, decides to set traps to destroy him.