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.