Consider the concept of dampness. When Xander's biology professor Aiden Starr tries to explain the concept of osmosis to him, this is what she tells him. When she uses it in practicum, she goes above and beyond by spreading her legs, letting him feel her moisture, and demonstrating how her pussy gets wet when she's aroused. By that point, the attractive blonde teacher has ripped her clothing off and is on top of her student. He's going to be fucking his professor on her desk soon after her large tits and his big dick are out! Biology became anatomy and then sex education.