Damien's Seed

Actually, by soft-porn standards, this ain't a bad movie. It has a vaguely supernatural element, although it's all implied rather than shown. The twist of the detective being the person being sought in the ritual is nicely done. Basically, though, it's an excuse to have the star get into bed with lots of women. He has a girlfriend (as is graphically demonstrated, natch), but that doesn't stop him from hopping into bed with two other women, not to mention being drugged and used as a stud by a cult of women-witch types. The acting is amateurish, making it kind of enjoyable in a cheesey sort of way.