It makes sense. Sex scenes were interesting when we didn't have on-hand porn streaming because it was something you didn't see often. Nudity and sex are now so readily available that they aren't exciting. As someone else said, just infer it.
Is it more interesting to see your girlfriend or boyfriend naked or in a sensual situation or porn? How about just someone you know?
Extending this logic, it is more interesting to see someone you know in se(x/n)ual scenes from an acting perspective. Meaning, while it's may not help the plot of every movie, I would say having these elements added by your favorite actor gives some pupil dilating special sauce that horny longdong and bouncy jangletits hardcore adventure does not provide.