"Sex is boring unless you're doing it."
-Ridley Scott
No hate to people with a consensual voyeur fetish and all but like...I would say the majority of sex scenes in mainstream films are entirely gratuitous. There are absolutely examples of sex scenes where I think they add to the characterization or story and removing them changes things (off the top of my head: American Psycho, and A History of Violence), but if you're putting sex in the movie because "OOOOH BOOBIES"....yeah...I grew up with internet porn. Its not all that exciting.