I’ll go first: Bull Durham.
Susan Sarandon plays muse to a struggling baseball team and teaches them how to play better by teaching them how to fuck better. On the surface, it's an unassuming, all-american movie about baseball, but it's my favorite depiction of sensual kink and experimentation.  

How many movies have a sex scene with Satan, after all?

I haven't seen it in some time, but I recall that scene being a little too tense and graphic for my tastes personally, but to each their own.

I think sex (or sexual innuendo) in movies is hardly unintentional.  So I suppose the question is how did they sneak sex into a movie that at first glance didn't suggest a sexual theme.
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Pleasantville was all about sex ... the black and white 50's people turned colorful after having sex.  Which kind of makes them stand out at first.
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Two exceptions... the mayor or whatever turned colorful after losing his temper.  And the slut from the future turned colorful after getting interested in reading literature.

I’m talking specifically about kink. My question was asking about portrayals of kink that aren’t explicitly labeled as such. Sex is everywhere, I want to know about kink.

It not only about automotive accidents.