Gwyneth Paltrow

When Gwyneth Paltrow's substitute teacher, Holly Holliday, returns to Glee's McKinley High on March 8, she'll be instructing the students in sex education. "All the kids are lost in their sexual knowledge," teases Heather Morris (Brittany).

Expect Holly to enlighten both Brittany — who "still thinks a baby comes from the stork," says Heather — and Finn, who "may finally learn that you actually can't get girls pregnant in a hot tub without intercourse," says Cory Monteith. That stunner could harm Finn's renewed romance with Quinn, who once told Finn that was how she got knocked up.

Some of the lessons become hands-on. "She shows us how to put condoms on bananas," says Jenna Ushkowitz (Tina). Adds Harry Shum Jr. (Mike), "I get a zucchini." Holly also encourages Santana to open up about her bisexuality and show a deeper side to new beau, Sam (Chord Overstreet). "Sam's a conservative guy," says Chord. "But now he's oddly turned on by Santana's forcefulness."

Not surprisingly, Emma will be irked by Holly's carefree approach to sexuality, especially when the sub locks lips with Mr. Schuester. "I am very, very excited about our kiss," says Matthew Morrison. "Gwyneth calls it her 'freebie work kiss.' That's how she gets to explain it to her husband."

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