Shades of Gray (1997)

Blonde with a tight ponytail and slim body takes it from a muscular dark-haired guy in his 30s under flashing colored lights. The sex is rough, mostly doggy style with a lot of deep thrusting — you can hear the slap of skin and she’s moaning loud. They switch to missionary at one point, face-to-face, and he’s gripping her hips hard while the strobe lights pulse in the background. Earlier in the day, she’s shown outside at an amusement park near a ferris wheel, walking alone with a carefree vibe, then later at a roadside with luggage like she’s on a trip. There’s a random cop station scene with two guys in uniform talking on stairs, plus an office shot with two men at a desk, but none of that leads into sex — seems like deleted clips or alternate plot threads. The main bedroom action is the focus, and the lighting gives it a gritty, late-night vibe that matches the raw fucking.