Lea Michele Reveals She Showed Jonathan Groff her 'Whole Vagina'

How dedicated were "Spring Awakening" co-stars Lea Michele and Jonathan Groff –�both to the show and to each other – when the show was on Broadway 15 years ago? The longtime friends reveal all in a new HBO documentary about the hit play, including how Michele helped Groff, who was still in the closet, understand more about female anatomy, People magazine reports.

"Jonathan and I became so close. We were so intertwined," Michele, 35, recounts in the HBO doc, which is aptly titled "Spring Awakening: Those You've Known."

"Michele and Groff starred in the Tony Award-winning musical as Wendla Bergmann and Melchior Gabor, respectively," Decider recollects. "In 'Those You've Known,' they recall their time working on 'Spring Awakening' 15 years after the musical first premiered in 2006. The doc also follows Michele, Groff, and their costars as they hold a special concert to celebrate the anniversary."

People explained the Broadway musical's storyline: Wendla, whom Michele played at the age of 19, "yearns to learn more about her maturing body and her sexual desires. When her mother cannot provide the answers, she turns to the radical Melchior Gabor (Groff, then 21), who takes her virginity and encourages her to listen to her urges."

The actors had to simulate sexual intimacy while getting "getting partially naked on stage," the article noted.

The relationship was never sexual in real life, but the two were close enough and comfortable enough that when Groff worried about not knowing much about women, Michelle was okay with taking a Method approach to helping him refine his performance.

"Lea and I were given this material where we had to fall in love," Groff reminisces in the doc, the People article said. "But the first thing I felt was, 'They're going to know I'm gay. Fuck. I never had sex with a girl, I'm in the closet. I'm just going to pretend that I know what I'm doing.' "

Michele confides that Groff came to her with his worries, telling her, " 'I've never seen a woman's vagina before. Would you show me?' And I was like, 'Sure.' And I took a desk lamp ... and showed him."

But it wasn't a "I'll show you mine if you show me yours" situation, Michelle clarified, going on to add, "I've never seen Jonathan naked. I've never seen his penis."

The two actors did, however, swap other things – including, evidently, some saliva.

"We made out so hard in this play," Groff, now 37, relates in the doc. "We would have like sweat, and snot was coming out of my nostrils, and saliva, and tongues, and mouths."

Despite this level of platonic intimacy –�or perhaps because of it – Michele offered herself as a surrogate if Groff ever decides to become a father, People reported in a separate article.

In a joint interview, Michele told the magazine about the joys of motherhood –�shared with "costars Lauren Pritchard and Lilli Cooper, who also recently became mothers," People noted – and, at one point, turned to Groff to offer: "I'll carry your baby."

"You will?" Groff asked.

"Hell yeah!" Michelle reassured him. "I love being pregnant. It's so much fun."

At that point, Groff responded the only way anyone, perhaps, could: "Good to know."

"Spring Awakening: Those You've Known" premieres on HBO May 3.