Test the theory

"I wonder...does Yang like being humiliated?" Ruby said. "Yang! I bet I can smack my ass better than you!"

Yang turned. "What the hell have you been teaching her, Arc?" Yang asked, glaring. "But I totally can! Watch this!"

Her hand made its way to her ass, giving it a firm, hard smack. "See?" she asked. "Didn't even hurt!"

Jaune couldn't help but snicker. So Yang did have a humiliation fetish? For someone who oozed as much confidence as she did, it was certainly a shock.