"...wouldn't... most sex... involve babies?" She is sort of aware that it is in theory fun, or that at least a lot of people want it, but-- the consequences do seem more important.

"Okay, so, this is your clit." He points. "It is the single part of the human body that has the most nerves and it is the only part of the human body with no purpose other than pleasure. If you touch it when you're turned on you're going to feel really really really good and you're going to want to keep touching it, and then if you do that eventually all of your muscles are going to tense up and it's going to feel better than anything you've ever felt in your life, like, pure and absolute bliss, and all the tension is going to release and you're going to want to go to sleep. Or have another one, girls can have multiple orgasms. --It's called an orgasm."

She kind of doubts that there's any part of the body that exists just for pleasure and not for survival. Also kinds of doubts the existence of anything that could be described as 'pure and absolute bliss' but-- Wei Wuxian probably knows more than she does about these things. (Which is kind of weird, seeing as he's a guy, but here they are." "Do orgasms-- do anything? Or do they just exist?"

"Guys produce sperm when they orgasm, for girls it's just. You know. An incentive to have sex."

"So that's how the sperm gets involved." Minor mystery: solved.

"So what you want to do is start thinking about people you think are pretty and then, like, kissing them or looking at them naked or touching them-- or other things, like, you might want to think about telling them what to do or tying them up or getting tied up or, uh, being forced into sex, that one's incredibly popular-- and then you touch yourself all over your body but probably especially your breasts? Breasts and nipples are very sensitive. And then you'll start feeling all good and squirmy and then you should touch your clit."

Is there a reason this got so instructional? She's not sure.

(She is also somewhat distracted by calculating whether she counts as pretty people to Wei Wuxian. Probably not? But, also, maybe?)

"--okay. ...I'm not sure this explains whats going on with Jiang Cheng and Jing Yi?"

"I'm getting there! So when you fuck a girl, you basically do the same thing? But you have more options, because there are two people. So you're kissing and touching and stuff, and saying nice things about how much you love each other. And then she can touch your clit or kiss it-- that's called eating you out-- or rub it on your body. And then orgasms for everyone!"

"I--uh-- what."

"--okay so which bit was confusing."

"I could-- have sex-- with another girl."

"You see why I was concerned that you didn't know this!"

She should be saying sentences. Coherent phrases and words. Instead of just staring at her friend while gears turn loudly in her head.

Wei Wuxian is going to wait for her to process this information before he tries to provide more sex education.

"--And by extension, two men could have sex?"

"I'm going to make another diagram while you process that."

She is going to process that by watching the diagram get made.

With a flourish he presents:

(The diagramming process involved some redrawing as he tried to figure out exactly how he should draw lines between the bladder and the urethra and the prostate.)

Ah, the dangers of trying to do anatomical drawings.

"I do know what this is."

"That's antifeminist, you know. You know about penises but not about your clit."

"How would it be antifeminist to know anatomy?"

"You should know more anatomy! Specifically, the anatomy attached to you. --Did you know that you can track whether you're ovulating or not based on the consistency of your cervical mucus? If you're ovulating it's like eggwhites."

"That could be useful-- I mean, there are probably better ways to tell, but still."

"Why would it be useful?"

"You might want to know if you're ovulating?"