Lea Michele says she showed Jonathan Groff her 'whole vagina' to teach him about anatomy while performing sex scenes in 'Spring Awakening'

• Lea Michele said she showed Jonathan Groff her vagina when they costarred in "Spring Awakening."
• "He was like: 'I've never seen a woman's vagina before. Would you show me?'" Michele recalled.

Lea Michele said she showed Jonathan Groff her "whole vagina" to teach him about anatomy while they were costarring in the musical "Spring Awakening" in 2006.

"At one point, I literally showed him my whole vagina," Michele said in a new HBO documentary, "Spring Awakening: Those You've Known," celebrating the 15th anniversary of the Broadway production, People reported.

"He was like, '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," she recalled, noting how close the pair became during the musical.

"But I've never seen Jonathan naked," Michele added. "I've never seen his penis."

The pair engaged in a sex scene during performances of "Spring Awakening," with Groff's character taking the virginity of Michele's character.

"We made out so hard in this play," Groff said in the documentary, People reported. "We would have like sweat, and snot was coming out of my nostrils, and saliva, and tongues, and mouths."

But at the time, Groff said he was still figuring out his own sexual identity. He came out as gay three years later.

"Lea and I were given this material where we had to fall in love," Groff 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, 35, and Groff, 37, who recounted how close they became during the run of "Spring Awakening," are still best friends a decade and a half later.

"I'm so grateful that we connected in the way that we did so that we were then able to go on the stage and then have that level of trust," Michele said of Groff, People reported.

"I felt so safe with him every night," she continued. "The character of Wendla was such an honor to play, and as an actor this is such great material, but it's still hard to have to go there every night, and I couldn't have done it if it wasn't for Jonathan."

Michele even told Groff in a recent interview that she'd be his surrogate if he ever wanted to have children.

"I'll carry your baby. I will," the "Glee" star told Groff during a chat with People.

"You will?" Groff asked, to which Michele replied: "Hell yeah! I love being pregnant. It's so much fun."

"Good to know," the "Hamilton" actor said.

Michele has one child, a 20-month-old named Ever, with her husband, Zandy Reich.