I own far too many of these films for my own good.
Just a glutton for punishment, I suppose.
On to the ranking...
1) Papaya, Love Goddess of the Cannibals
2) Erotic Nights of the Living Dead
3) Orgasmo Nero (aka Black Orgasm)
4) Sesso Nero (aka Orgasmo Nero III)
I haven't seen, Hard Sensation, Porno Esotic Love, or Porno Holocaust sadly, although I'm still searching for that latter!