Last night's (Mar. 8) episode of "Glee" marked the return of Gwyneth Paltrow's saucy substitute Holly Holliday, who sets out to educate McKinley High about sex (which she says is "just like hugging, only wetter"). She educates Mr. Schuester as well, as things heat up between the two teachers as they tango to Prince's "Kiss."

Meanwhile, Emma takes over the celibacy club, where her personal fear of the "hose monster" is revealed, and John Stamos rejoins the cast as Emma's under-sexed hubby Carl.

Holly attempts to teach the New Directions about sex through song, resulting in a sultry rendition of Joan Jett's cover of Gary Glitter's "Do You Wanna Touch Me" with an assist from Santana and Brittany. This song was more striptease than sex-ed lesson, but at least the students are paying attention.

Video: Gwyneth Paltrow Performs "Do You Wanna Touch Me" on "Glee"

Sue pays a visit to Kurt and Blaine, informing them the judges at Regionals will be scoring based on sexiness. Blaine invites the girls of a neighboring school to watch The Warblers' performance of "Animal" by Neon Trees, in which Blaine is, admittedly, very sexy.

Video: The Warblers Perform "Animal" by Neon Trees

As the members of the "Glee" cast begin to explore their sexuality, they turn to Holly for help. When Brittany and Santana ask for help in figuring out their feelings for each other, Holly encourages them to find a song that expresses their feelings. The three ladies perform a tender rendition of Fleetwood Mac's "Landslide" that ends with Santana in tears, expressing her love and desire to be with Brittany.

Video: Holly, Brittany and Santana Perform "Landslide" on "Glee"

When Will and Holly get together to perform Prince's "Kiss," their tango dance sequence proves racy but we're still unsure about Schuester's falsetto. Will begs Holly to go out with him, but she refuses, calling herself "damaged goods."

Video: Holly and Will Perform Prince's "Kiss" on "Glee"

Emma tries to show the students the benefits of celibacy by performing a song; however, her song choice of "Afternoon Delight" by the Starland Vocal Band doesn't exactly fit the bill. Emma and Carl meet with Holly to discuss their sex life -- or lack thereof. Holly asks Emma if she is still in love with Will, and Emma doesn't exactly say no.

Video: Emma, Carl and Celibacy Club Perform "Afternoon Delight" on "Glee"

Brittany refuses to leave Artie for Santana, but Holly decides to give dating Will a shot. We learn Quinn and Finn have gotten back together when Finn leaves a hickey on her neck. Kurt starts down the path of sexual enlightenment when Blaine convinces Burt (Kurt's dad) to talk to his son about sex.

The episode ends with everyone a little more educated about sex -- and, as usual, about themselves. Next week's episode marks the premiere of Glee's first original songs, "Loser Like Me" and "Get It Right."