Gwyneth Paltrow made her return as substitute Holly Holiday on tonight's 'Sexy' episode of 'Glee' -- and boy did she heat things up as McKinley High's stand-in sex-ed instructor. PopCrush has your recap, including all of the naughty details, right here.

Emma launches a Celibacy Club with Quinn and Rachel in order to create a viable option for those afraid of the 'hose monster' -- or in her words, "Celibacy ladies, dig it!" But with the regular sexual education teacher out with "the herp," it's Ms. Holiday to the rescue -- and she's ready to spread her book of knowledge. She instructs the students on how to put on condoms using cucumbers, but the 'Glee' kids seem a bit confused about where diseases hide, and Brittany alleges that the stork nesting on her garage roof is preparing to bring her and Artie a baby.

Ms. Holiday helps Will co-coach the glee club in "sexy" -- aka the gruesome details of sex -- with a stripped down (literally) performance of ‘Do You Wanna Touch Me (Oh Yeah)’ (Joan Jett and the Blackhearts), which has Mr. Schuester drooling all over his pleated pants, even though he thinks her performance is a tad over the top. Soon, all of the glee club is seeking their internal sexy, and Lauren Zizes recruits Puck to make a sex tape so that she can be more like a Kardashian and snag a recording contract.

Sue gives Kurt and Blaine the inside scoop that the only way to beat New Directions at Regionals is to "out-sex them," and the head songbird orders for an emergency meeting. Kurt, Blaine and the Warblers sample a steamy warehouse performance of Neon Trees' 'Animal' on an all-girls school -- complete with a soap suds dance party. But Kurt quickly realizes has about as much sex appeal as a baby penguin.

It takes two to tango -- so when Will tries to turn a classic Prince song into a dance number, Holly steps in -- and the pair lay down a spicy duet of 'Kiss' that truly gives this 'Glee' episode its name. Naturally, the song comes to a close with the steamy kiss we've all been waiting for! Could this mean Paltrow will be back in Season 3?

Substitute Holiday prompts Brittany and Santana to explore their friendship -- and question whether it could be more -- with a song that helps them express their feelings. With help from the blond mentor (okay, she sings the whole thing), the two former cheerleaders perform Fleetwood Mac's 'Landslide' for their peers.

Puck joins the Celibacy Club, and with a hand from Dr. Carl (aka John Stamos), Emma, Rachel and Quinn, the group performs a wholesome, jazzy version of ‘Afternoon Delight’ (Starland Vocal Band). But Holly points out that Emma is a bit confused about the meaning of a 'nooner' -- it is in fact not an sweet snack break in the middle of the day. Eh, pie causes cavities anyway!

Ms. Holiday becomes more of a therapist than a teacher in Season 2, Episode 15 of 'Glee,' because in addition to student sex-ed, she urges Emma and Carl to open up about their sex life -- or lack thereof! Now there's a shocking revelation. We also learn that Santana has the hots for Brittany, but she's scared to step out of the closet, and Brittany's loyalty to Artie creates a continental divide between them. Meanwhile, Quinn becomes a celibacy club reject as she and Finn charge their past feelings -- sexually -- and Will and Holly pursue a true relationship.

We loved Gwyneth's sparkling return to 'Glee,' and tonight's 'Sexy' episode could have just as easily been titled 'Paltrow!' Stay tuned -- next week the glee club will debut their original songs at the Regionals competition.

More From PopCrush