Originally Posted by 2000dB
The japanese movie you're refering to is called Tetsuo (the iron man) and it's seriously a disturbing and excellent movie. The movie is not based around a man mutilating women with his penis, but does indeed drill a girl while having sex at some point, it's quite a weird scene. You should also check out the sequel and in the same genre (man vs. machine) you should check out Meatball Machine. It's a lot easier to watch, but it's also a lot less captivating... still good though.
Tsukamoto's films are generally excellent (well, Hiruko is ok but not stellar, as is Bullet Ballet...).
Will look for Meatball Machine.