The groin, as you all know, is one of the most sensitive areas of the body -- and, therefore, one of the best areas to target in self-defence. How you execute that groin attack, however, can make all the difference.
In the video above, Modern Combat and Survival points out that trying to kick the groin from far away might not be the best idea, since it gives the other person more time to detect and deflect your move (and you might get inadvertently head-butted in the process). Instead, use the groin attack as your follow-up or secondary attack, and use your knee instead of a kick for more force.
If that's not enough groin attack footage for you, here's 100 ways to attack the groin.
Self Defence Groin Kick Secret [YouTube]