Night of the Cobra Woman (1972)
Plotline: Woman gets bit by cobra in the forest. In order to stay youthful after said pet-cobra dies, she must suck the life out of men to replace her own (and this is, of course, done by sleeping with them). Snake-venom is also involved in keeping her youthful, though I'm still not 100% certain how.
Scariness factor: Camp at its finest.
Gross-Out Factor: Just sweet-ass transformations from humans to snakes. That's about it.
Complaints: Hee hee--none. It was a good campy movie, so what was bad was basically the best part.
High Points: As E so thoughtfully put it, "That movie was totally just an excuse to show boobs." It was a delightful excuse though. The main character's real-life name is "Joy Bang" (if that gives you any idea). It's horridly 1970s. There's lots of inadvertent guy-on-guy innuendo in it. The plot makes little to no sense at times (I actually heard someone lean over to their date and be like, "So wait, *how* does the venom work again?"). The acting is cardboard. The main male-lead is rail-thin and horrendously 1970s in demeanor. And the human-to-snake transformation sequences are WAY too fricking funny.
Overall: So funny. Definitely give it a watch if you can get your hands on it.