I was also going to recommend The Thing. The creature itself is pretty trippy, but most of the kills happen off-screen and considering it takes place in an arctic wasteland staffed by Keith David, Wilford Brimley, Kurt Russel and a bunch of dogs you can be pretty confident you're not going to see much eroticism.

I'd also recommend Night of the Living Dead. For its time it might have been shocking but it's actually pretty tame considering the subject matter.