I think if most people were asked "What’s the difference between a mainstream movie and a softcore porn film, they’d respond, “Softcore porn is whatever Cinemax is showing between 11 p.m. and 12:30 a.m.”
But we as Dopers must hew to a higher standard, i.e., we must examine the actual content of a film to decide if it’s softcore porn or mainstream. What is the deciding factor? Is it the presence of nudity? If so, we must define every R rated film where an actress doffs a bra as softcore porn, as Halle Berry famously did in Swordfish. Is it the AMOUNT or TYPE of nudity? If so, what amount or what type?
Perhaps it is not the nudity, it’s the sex. Of course, there have been an awful lot of mainstream films that have featured strong sex scenes:* Body Heat, Cat People, Don’t Look Back, Betty Blue, Requiem For A Dream,* etc. Very long list, there. Is it the amount or type of sex? If so, what amount or what type?
Is it the nature of the plot, that is, is it that the plot exists only to further the sex and nudity? If so, what are we to make of the occasional sex and nudity drenched film that actually has a working plot, such as Flesh Gordon or The Key To Sex? And what are we to make of mainstream films that feature relatively little sex and nudity but have plots that make little or no sense, like* Sliver* and Body of Evidence? Or even unfunny mainstream films that are supposed to be sexy fun, like Exit to Eden?
Of course, some my cry, “I know it when I see it,” but I am expecting a far higher standard of logic and reason from Dopers than the inanities that escape the mouths of Supreme Court justices. So, have at it.