In a meeting of scientific minds, astrophysicist Dr. Neil DeGrasse Tyson hosted sex therapist Dr. Ruth Westheimer on his “Star Talk” podcast, and what started as a viewer’s question about the former planet Pluto segued into a topic firmly in Westheimer’s wheelhouse.

“Concerning Pluto’s planetary status, does size really matter?” Tyson said, reading the question before laughing.

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“Neil, tell all of your viewers: size of that part of the male anatomy that we are talking about — the penis — size does not matter,” Westheimer replied. “A woman’s vagina can accomodate all sizes. Now, if someone has a miniscule one, that’s another story.”

Westheimer also had advice for men looking to increase their sexual self-esteem.

“Here is what I tell them to do — not in your studio, at home,” she offered. “Stand in front of a full-length mirror, bring yourself to sexual satisfaction, stand there and admire the erection. You will never worry about penis size again.”

Later in the show, Westheimer also offered her perspective on male enhancement products, or “chemically-altered sexual performance” pills, as Tyson called them.

“Anybody who’s doctor says they can take these pills, I have nothing against it,” she said. “However, an important point: Here’s a man taking the pill, he now has an erection from the floor to the ceiling -”

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“I’ll take your word for it,” Tyson interjected.

“He comes home, and he says to his wife, ‘Pop into bed,’ because he thinks that’s the last erection of his life,” she continued. “He forgot her birthday. He forgot to bring flowers on Valentine’s Day. If there’s a sports event in our culture, for three days he hasn’t talked to her. He was watching television.”

“Beer and chips in front of the TV,” Tyson said in agreement.

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“And everybody here in your studio, [and] who watches you, knows what that wife is going to say to her husband, what to do with that erection,” Westheimer concluded. “I’m all for help when it’s needed, only by prescription.”

Watch Tyson and Westheimer discuss the ins and outs of love, as aired Monday on the “Nerdist” YouTube channel, below.