[Jack has a lot of considerations running through his mind. He's not a good artist and he doesn't exactly feel inclined to just show her one. Time to use words.]

Well, I'm about to blow your mind. Guys have these dangly bits sticking out instead of a vagina like you do. That's the penis. And when they get themselves good and properly worked up with the right kind of thinking, that dangly bit spews out the sticky white seed I mentioned. The only way to get that to a woman's eggs is for the penis to go inside the vagina. Multiple times.

And it feels awesome.