Audiences certainly do, if the blockbuster success of “Fifty Shades of Grey” is To simulate sex, actors employ tricks: pillows between them.
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.
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.