Adult movie from decades ago

It's a very specific scene. It's two adults, naked, having sex. In bedroom. Red colored/theme. Towards the end, the woman starts growing wings as she climaxes. I have no idea what it was. A second movie that I can't remember, is some type of monster movie. Something that resembles a tentacle or penis monster (because it kinda resembles it). At the very end of the movie, you faintly see it and hear a woman moaning. This is all I remember and can piece together for the movies.