I was code-diving recently - nympho scenes for fellow students are pretty rare because they can only trigger when you encounter the character in the school hallway in the morning or midday. It then rolls d20 compared to a number based on their inhibition - supposed to require <=3 between 80 and 100 inhibition, <=4 between 60 and 80, and so forth. Minor coding error means that it actually requires EXACTLY 3 in the first circumstance, so it's really hard to get the nympho scenes to trigger if they have high inhibition.
edit: Willpower doesn't matter, though. Inhibition to trigger the scene, corruption to determine what scene is used.