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Replace "sex scene" with "action sequence." There are plenty of movies where the action sequence is engaging, "thematically relevant" (as another commenter phrased it), and enhances the movie. Then there are Michael Bay-type movies, where the action sequence is over-the-top, gratuitous, and feels like filler that you have to get through before the actual movie can resume... in other words, an "unnecessary" action sequence. There's nothing wrong with movies with gratuitous action scenes existing; there is a place in cinema for Rambo and the MCU, just like there's a place for smut. But much like how I don't want to have to sit through a gratuitous CGI-heavy action sequence in the middle of a historical drama, I think it's legitimate to question the addition of sex scenes in movies/TV where you wouldn't expect it (or wouldn't expect it to be so long/graphic), especially if it doesn't feel like the scene added anything to the movie other than titillation.