Yakuza: Like a Dragon Ballbusting Compilation
When I started playing this game I just wanted to get clips of these attacks. Then I realised you have to get about halfway through the game to unlock them. Luckily the game's actually really good.
A couple of these aren't intentional groin attacks (Luscious Guillotine is supposed to be a kick to the stomach but hits taller opponents in the groin) but most are. Enjoy.