Damn it, Solarius, if it's not the balls, then what is it? Do you know how hard head shots are? They're . . . well, admittedly easier than ball shots, but that's not to point!
PS: I am the one who loves to do an aimed shot at the groin as a final attack on enemies in the original Fallout games . . . just because I see it as a funny way to kill someone, so . . . take it for what it's worth.