There are some Hollywood movies where there are unsimulated sex scenes, Gaspar Noe's work comes to mind.
Sorry, but Noe is in no way mainstream and would take you to task for calling his movies anything remotely Hollywood. Neither is Lars Von Trier or Park Chan Wook. We and our circle of friends know them, but you could walk down the street and ask 1000 people about them and even show the movie poster for Love or Dancer in the Dark and people would maybe remember that Bjork wore a swan dress to the Oscars and that is about it. That is not mainstream.
FurthermoreIn no way is a mainstream studio like Fox (now Disney) is going to do real sex. Nor will mainstream actors who are doing blockbusters and awards bait fare. Well, not these days, as I think of a movie with Donald Sutherland that was filmed about 49 years ago. But back to the point that is why I said it was a stupid, silly question. But this same person could also not understand whty rich people would have multiple homes in different countries. Her problem is that she blends real and fiction together and can't tell the different. Unfortunely, there are many "fans" like that.
ETA: It is hilarious to note that the two people who liked your comment is an intern who pretends have her finger on the pulse of the entertainment industry while trashing Alex from here to Kalamazoo and generally wrong. The things she said about him and his mother and her battle with alcoholism in Gustaf Skarsgard's thread was heinous to say the least.
The other person was trying to convince people on this thread that Skarsgard needs to emulate Hiddleston and Fassbender. Two actors who have not booked new screen roles for moving into four years for obvious reasons.
As I wrote previously, be careful and try to work with good people on good projects when you can, but get not caught up in a loop of chasing awards. It does not turn out well. I feel like Jake Gyllenhaal is in that loop right, but hopefully something light like him currently doing a Spiderman villian will take him out of it.