Uh haha I actually do that lol sorry, on account of all girls who do that, but I would say, don't try to dodge the smacks or whatever, just kinda tell them "hey, that kinda hurts, so do you think you could stop doing that?" and she will most likely blush and be like, " oh I'm sorry haha I didn't mean to hurt you." and that will end it. best of luck!

oof. Sorry I couldn't be of more help. Good luck!