Great question, Viridiana.
Interesting that there seems to be a lot less sex on screen in movies nowadays. Compare to the 80s and 90s, for example, with movies like…
Great question, Viridiana. I don't think there's a "right" answer as the degree of specificity or approach to tone when writing sexual activity is so depending upon the nature of the story, the dramatic point of the sex, the writer's voice, and so forth. I would suggest reading movie scripts in which there are extended or meaningful sex scenes to see how they writers may have handled those scenes.
Interesting that there seems to be a lot less sex on screen in movies nowadays. Compare to the 80s and 90s, for example, with movies like Fatal Attraction, Basic Instinct, or the 70s with Don't Look Now. I'm not sure why that is.
Here's an article on that subject you may find helplful: https://gointothestory.blcklst.com/sex-in-cinema-7e46b2813d35