A female friend of mine (who I occasionally have sex with) wants me to teach her some grappling. The other day when I was showing her a couple arm locks she implied she could have recourse to other tactics, and a couple minutes later mentioned her "ball grabbing hand." This was at a party with a bunch of people around, and we talked about meeting up some other time to fight. She asked if she could hurt me in "secret ways," and I said yeah. We haven't followed through yet, but just thought I'd mention...