It takes a lot of movie magic romance to make it appear as though actors in a sex scene are actually in the throes of passion. Most famous movie sex scenes are.
When they work, she added, “everybody actually enjoys them. So in “Fatal Attraction,” the scene where they [have sex] over the sink, I knew it.
If an actor is working on a non-union film, they are not protected by the union. This is why many actors choose not to do nudity or simulated sex.