> When revisiting a beloved Eighties or Nineties film, Millennial and Gen X viewers are often startled to encounter long-forgotten sexual content : John Connor’s conception in Terminator, Jamie Lee Curtis’s toplessness in Trading Places, the spectral blowjob in Ghostbusters. These scenes didn’t shock us when we first saw them. Of course there’s sex in a movie. Isn’t there always?
None of those were major studio action blockbusters (Terminator, one might mistake for that because of the resulting franchise, but it was an indie film that hit it big; all the rest are out-of-genre.)
So, if those are really your comparisons, the problem may be that you are comparing fundamentally different kinds of movies. The description of “even when they have sex no one is horny” seems to be pretty typical, over a long time window, of action blockbusters. Horniness is big in comedy, romance, and erotic subgenres of other genres, but it's not big in action (though non-blockbusters might include it because they tend to have more freedom to depart from genre rules.)