Keep in mind, the movie poster and trailer makes it clear, this film is influenced by the swank of the 60's and 70's. Huge hint: the purple font for the title and credits. Hello. If that doesn't tell you what's up...
Be ready for a touch of camp. It seems to me, Kiss of the Damned, is equal parts silly (note, the music) and serious (willingness to just go for it). Much like Jean Rollin, a master of lighting and imagery, the director of Damned uses the screen shots to full advantage. Yet be prepared for a couple over the top moments--like the fights between the sisters--and some slow spots--like when nothing is actually happening. But shoot, nothing happening for a minute or two is no big deal. Be patient, viewer.
A couple reviews I read were concerned about the teen market watching the violent sex. Apparently these reviewers have not seen The Vampire Diaries, a series where the males regularly throw the females around. Here its the males who are getting the rough treatment and for the most part they aren't complaining.
The trailer below will give you a little idea what you're in for but if you're intrigued I say just open a bottle of wine and go for it. If anyone tries to tell you watching Kiss of the Damned isn't a good time, they probably don't know or like the genre and had no business watching it in the first place.