I’ll also tell you a little hint that no one has found for sure :)
You may have noticed that the Lisa, if you hover over her in the main menu, will begin to dance a little if she is not in the water (in the water she spreads her legs a little, and the steam dissipates). But if you click on her mug, which is on the windowsill, you can add a pink pill to her, which will initially add horny points to her when the next scene starts)