I encourage everyone to take at least a simple, basic self-defence course somewhere. While a kick to the crotch is painful to men and women, there are other simple techniques everyone should know in case this one attack vector isn't an option. One example is quickly slapping their ears with cupped hands, as if trying to clap with their head. It also helps to practice the right motions a few times, ideally on someone with a protective suit so you can actually use your full force.