sex scenes are shown in hollywood movies. we see naked actress and actors riding and issing each other but do they have real sex scene or just they do such acting.
In movies, it's considered more than an R-rating if they show a man in full frontal nudity. With women being completely naked, it's considered an 'artform.'
The actors don't really have sex in the movies. Most of the scenes are shot at certain angles to give effects. If a scene is shot of a guy and girl having sex, but it's only shot from the shoulders and up, I guarantee that they are wearing underwear.
Also, certain shots aren't even the real actors or actoresses, just doubles.
Example: Titanic-when Jack is drawing that picture of Rose of the couch, that's not really Leonardo de Caprio's hand drawing the picture, and Kate Winslet is probably wearing some kind of article of clothing in certain scenes.