Norman J. Warren's Prey aka Alien Prey

Well that was weird.
A flesh eating alien scout, a murderously psychopathic lesbian and a sub bisexual meet in a cottage and play out a nearly indescribable variation on psychodramatic tropes. Watch sex of Jess Franco-like ickyness, aliens in drag, eaten animals and slow motion pseudo drowning. Ask yourself why. Cry, laugh and...Damn, I'm starting to sound like a Bleeding Skull review. So just watch it.

But don't forget the moral of the story: Humans are tasty.