The title pretty much says everything. A spaceship crashes on Earth, bringing a group of vampire whores from outer space.
This movie is a comedy. You can look at it as a spoof of cheesy horror or scifi movies. This film is done in the spirit of a really good classic Troma film. There's almost no vampire stuff. There's almost no whore stuff. What we get is a really funny movie that never takes itself seriously and the bad acting is bad in a good sort of way. When the whores' pimp shows up in a cheesy green alien halloween mask, we get a really funny parody of Michael Jackson's Thriller video.
If you're the kind of person that likes really bad movies that are done in the spirit of cheese for cheese's sake, then you'll love this movie.