Hardboiled Daddy 1,2,3,4
Not as sinister as it sounds really, the main guy never sees the school girl he's taking care of as anything other than a daughter figure (even if you do see her tits). Also he has sex with lots of different women, in the first volume alone he has sex four different times with what appears to be four different women.
Hiatari Ryoko! 1,2,3
Saw one episode when I was in Japan last year and couldn't get enough of its 80's-tastic goodness from the opening song and stuff like that
Typical Tetsuya Saruwatari and I have no problem with that, also its from 1986!
Cyber Blue 1,2,3,4
Cyber Blue is pretty much Fist Of The North Star except this time Kenshiro is blonde, uses a gun, a robot and says fuck a lot. Also one of the villains is PRINCE! and its awesome! You can see him on the cover of Volume 3.