– I watched it between 1987-89 so I assume its from the 80es.

– It was in color and I think english is the original language.

– The creature is probably more kind of a demon and not a classic monster.

– I remember a scene where a dark haired young woman gets
attacked or possessed by it, (it could be in a bathroom).

– I think the tentacle is used to possess ppl and (sexually stimulate woman?)

– Cause I remember it had a bit of a sexual tone but more like a softcore and not hentai, also it was kinda comedic I think

Sorry, I know its all super vague..