Worried about the pupils' lack of knowledge about the birds and the bees, Holly became a graphic sex-ed teacher, using a cucumber and condom to make graphic illustrations.
Dressed all in black leather, the 38-year-old then sang Joan Jett's Do You Wanna Touch Me. She told the kids, 'So, just remember, whenever you have sex with someone, you're having sex with everyone they've had sex with.'
But Gwyneth also brought in some romance with Will Schuester, played by Matthew Morrison.
Having praised his 'fine man-butt' she initially warned him off, despite a sizzling kiss following their performing Prince's Kiss together.