just tell them rapist like to wrestle & if they still have an issue just say hey ! you spend hours in front of mirrors looking at your body, if you love your body why not protect it. & if training with dudes or the guard is too weird with dudes just say hey ! don't be silly, are you a virgin ? do you have a boyfriend ? then get over yourself, theres nothing sexual about training jiujitsu and it's not like dudes havent been between your legs before. so why not learn how to kill potential rapist from that position. sometimes girls are oblivious to reality and like to avoid the truth so being blunt and honest with them is the best way.