"Sexy pictures! Do you know if you like men or women better? And what kinds of things you fantasize about?"

Masozi does not have the faintest idea, and stares blankly at him. 

"All right, I'll get you both. Something nice and softcore."

He takes out two pictures. One is of a Chinese man, thin to the point of being underweight, with long hair and no body hair; his eyes are half-lidded and his mouth open in arousal as he strokes his erect penis. One is of a white woman with round hips and a big ass and thick thighs and a bit of a stomach and breasts half the size of her head; she contorts herself so the viewer can look at her breasts and her ass at the same time and looks at the viewer with a huge smile that lights up her whole face.

Masozi...continues to be very confused about the point of this! Probably he's supposed to say something, though. 

"...The woman looks like she's probably rich?" he offers. "She looks so healthy. Like she has enough to eat all the time." 

Is that how sexual attraction works in Malawi? Nie Huaisang knows nothing about Malawi.

"...you can have that one if you want," he says, "I don't like girls very much."

"What am I supposed to do with it?" 

...Nie Huaisang raises his estimate of his amount of confusion about Malawi.

"You're supposed to look at it and then get hard and then touch yourself until you come while thinking about fucking her?"

Masozi REMAINS CONFUSED and has no idea what questions to even ask to resolve this! 

"But I...don't think I want to fuck her?" he says finally. "I guess maybe I...want to imagine that she could be my baby sister's new mother, because she'd take such good care of her, but that doesn't seem like the same thing." 

"Okay, but what kinds of people do you want to fuck?"

How on earth is he supposed to know the answer to that question??? 

"I...never thought about it before?" Masozi says slowly. 

"... ... ...I'm not sure how you could avoid thinking about it? It just sort of happens?"

"I don't know when I would've had time to think about it! I just got here and before I got here I didn't have time to think about anything except fighting off mals and learning English better!" 

"Right, but you're looking at someone and it just sort of pops into your head... wow this person is pretty I want to touch them... wait, you do know what sex is, right?"

"Yeah! It's how women get pregnant with babies. And I guess people do it just because? ...My parents did it a lot. I guess that's why my mother was always pregnant." 

"Oh that's not very good sex ed at all."

'Sex ed' is a really baffling concept!

Masozi clears his throat. "Are you - do people usually go to classes on how to fuck?" 

"Okay, so, sex feels nice? Which is why people like doing it. It's actually the most intense physical pleasure you can experience unless you take drugs. In the outside world if you have sex with girls there's medicine she can take to keep from getting pregnant but it's not very reliable in here, so you shouldn't have sex with girls until you graduate. And you shouldn't go 'oh, I'm going to go be alone with this girl and kiss her but not have sex', because kissing makes you want sex and then you might end up having sex with her anyway."

(Nie Huaisang takes this on faith because he can't imagine any other process that would make him want to have sex with a girl.)

"But you can have sex with guys because if you have sex with guys you can't have kids. So you kiss and touch each other and say nice things to each other. And sometimes if you're into that kind of thing you can hurt him or tie him up or say mean things to him or boss him around, some people like that-- or the other way around, like, maybe you want to get hurt and bossed around. And then when you really want to you can touch his dick or put his dick in your mouth or rub your dicks together or put your thighs together so he can rub his dick between them. Or you can get some spit and spread it on your ass and then you can put fingers in it or his dick or a dildo, and that feels really incredibly good. And then you both come and you feel all happy and cuddle."

"...I'm still confused," Masozi says, blankly. "- I don't get why people take drugs either - wizards, I mean - it sounds like it'd be really bad for keeping a lookout for mals." 

"Because it's fun and makes them happy?"

"But learning spells is fun too and it's more useful for surviving?" 

"Okay, so, I think what you need to do is next time you wake up hard you should touch it and then this will rapidly answer your questions about why people have sex." He considers this dubiously. "I think it still works if you don't have anything sexy to think about."

"...How long does it take to test it? I usually have things I want to do in the morning before breakfast." Namely, sneaking into the bathrooms and collecting mal grubs to add to the little mal-grub-terrarium he's set up in one of his dismantled drawers, next to the one with the dung beetles, covered in mesh from the shop supply room.

"Maybe ten minutes? I don't know if it'd be longer because you don't know what you're doing or shorter because you haven't come much."

"...Come?" Masozi says blankly. He's not familiar– well, he knows the word but in this context it's just baffling. 

"The part where your penis shoots out white stuff and it feels incredibly good and then afterwards you are kind of flopped and happy. --It's, uh, the primary part that makes a baby if you're having sex with a girl but you definitely shouldn't put your penis inside a girl at all, they can get pregnant before you come."