In health and physical education classes, students learn about the differences between men's and women's bodies.
Make groups with your classmates and observe each other's bodies.

"Hey, look. Ishikawa's got some hair even though she's so small. I thought she was smooth."
"You're right. She looks like an elementary school kid, but she's got some pubic hair."
"It's really thin though. But her boobs are so small..."
"Wh-what are you talking about? You guys, take off your clothes too! I'm the only one who's embarrassed!"