Pervirella!
Pervirella runs from the masturbating monster, is saved by Amazons, but is taken captive. Sorry, I think my random sentence generator went haywire...no, no - that's really the only way to explain this clip, from a much larger naughty movie called Pervirella, as discovered by - who else? - a website full of scifi geeks. Congratulations, io9, that masturbating monster will haunt my dreams.