The High Sun (2015)

There are two sex scenes in the movie. One is extended and one is brief.

In the second scene: a man during a party in a clear daze undresses with a woman in view of others who are streaking (running nude.) Only breasts are briefly shown here, though she comes on top to straddle him for a moment where they have a short moment of intimacy, which then stops shortly after as they part ways.