Not sure anyone has ever thought of this, but for girls who just aren't ticklish yet you wanna torture them in a similar way, what about tying them up and then rubbing itching powder all on their feet etc...a girl I know told me she thinks that would be twice as bad as being tickle tortured, and she can't imagine how much she'd beg from that torture. Plusssssssss think about it, if you have a girl who IS ticklish and you rub itching powder on her feet and stuff, then she'll beg you to itch her feet but then you will actually be tickling her feet, and it will make it worse...psychotic?