Hi!
I am looking for a movie I cannot remember the title. Can anyone help me please?

It is probably from the 70/80s. It goes on in a Hotel, if I remember correctly. There is somekind of creature, a worm like, that slithers. There is a scene where it crawls up a womans vagina, when she is in a bathtub. There is another scene where somebody kisses somebody and the creature changes bodies through the kiss. If I remember correctly, people kinda get a bit sexually enhanced/stimulated when they have the creature inside.
I believe the end is in a interior pool in the hotel...
Sorry for being so vague, but it's what I remember...

Thankz,:)
Riko