6 Wild Moments From The Sue Johanson Sex-Ed Show I Can't Believe Aired In The '90s (VIDEO)

When she explained why you shouldn't have sex in a hot tub

When a caller asked whether it was a good idea to have sex in the hot tub with their girlfriend, she immediately gave him a big "no."

"Now the hot tub has got chlorine in it," Sue explained. "And so you're having sex under the water, right? You're thrusting penis in vagina. You are forcing water into her vagina."

Apparently, this can lead to her vagina getting "sore, raw, red" and "irritated."

"And then they're worried that there's a possibility that the water will go up through her cervix, through her uterus and into her fallopian tubes and then drip into her abdomen. And there is some concern that that might cause endometriosis."

The more you know!

When she talked about vaginal farts

Next up, who could forget when she tackled the hot topic of "vaginal farts."

"I just called to ask, when my girlfriend and I have sex, either with a dildo or with her fingers, when I'm getting ready to have an orgasm I often have vaginal farts," explained one caller. "I was wondering, is there any way to stop doing that?"

Sue had a very quick answer.

"No! Why? Vaginal farts are wonderful things. It's something we can do, guys can't do it," she said. "And ours don't stink. Theirs do."

When she lectured someone about not using condoms for "bum sex"

When someone confirmed that they weren't using condoms for "bum sex," Sue laid out the facts.

"Now, Lisa, Lisa: think. He is putting his penis in your rectum, right? That rectum has feces in there," she explained. "Feces are loaded with bacteria. Now he's gonna pick up some of that bacteria on his penis, right? And then he's gonna have intercourse with you, vaginal intercourse and he hasn't washed his penis and he wasn't using a condom."

"You're gonna get the infection. I'm not worried about him. I'm worried about you."

When she was bamboozled by a camera on a dildo

"Well, you know what? They couldn't leave well enough alone," Sue said while showing off a sex toy. "And what they've done is put a tiny camera into the end of the dildo. Yes, you heard right. A camera that hooks up to your TV."

She then demonstrated how it would work by using her hand to simulate a vagina.

"Well, all I can say is thank god it's in black and white."

When she made David Letterman blush

This moment didn't actually happen on her sex-ed show, but while sitting down and chatting with David Letterman on the Late Show, Sue did not hold back.

"What are people talking about?" Letterman asked. "What do they want to know, what are they worried about? What are they concerned about? Are there any really new questions about sex?"

"Oh, yeah, there are quite a few new ones," answered Sue. "But the old preoccupation with penis size, you know, bigger is better, and if you're going to be a good lover, you've got to have a 12 inch —"

Before she could finish the sentence, Letterman cut her off, saying "Easy!" and tried to loosen the collar of his dress shirt in apparent discomfort.

He then proceeded to look around in disbelief and fan himself with a piece of paper.

"When that question comes up, how do you resolve it?" Letterman asked.

"You see, what people don't realize is that penis size does not matter. Because the top two-thirds of the vagina has no nerve endings," she explained. "There's nobody home up there."

"Bottom one-third. That's where the action is."

When she shared a story about peanut butter

And when asked about memorable calls to her show she's had, Letterman prompted Sue to chat about a question she had received about peanut butter.

"Well, you had to ask, didn't ya?" she said. "You want to go there?"

She then explained what happened.

"This guy phoned in and asked if it was okay if he could masturbate into a jar of peanut butter," the educator shared.

"That'll get you thrown out of the supermarket," remarked Letterman.

Sue then explained that during the calls, she wears a piece in her ear that connects her back to the control room of the show.

"And my director is saying 'ask if it's crunchy or smooth,'" she said of the situation, which caused Letterman and the audience to break into laughter.

"Well sure," said Letterman. "It makes all the difference."

"I've never eaten peanut butter since," Sue said.

An absolute icon — rest in peace, Sue.