Your STEP-dad left your STEP-mom and she's so salty about this. She believes all men are like this, and believes you're going to become this, too. No, she can't let it happen... she needs you to know how to scold yourself if AND when you hurt a woman in your future. She teaches you to slap your dick and balls in different ways, even slapping you herself if it doesn't seem like enough. With any luck, she hopes your balls will shrivel up so you won't be able to reproduce.