The original animated stuff is good, but the manga is the real source material and it's pretty wild.
Man, old manga is pretty hardcore. Naked girls everywhere, main characters who are real dicks, and violent in a way you wouldn't expect retro manga to be.
For real. I've always been really fascinated with that stuff.
Found I think the first chapter of Violence Jack online a few years back and gave it a read. That was a trip.