Inner Sanctum (1991)

The blonde in the pink blouse is the one who makes the first move, sliding off her skirt right there by the desk. She’s slim, mid-30s, got that put-together office look until she pulls her top open and drops down on him. They start with her riding face-to-face, both of them quiet like they’re trying not to get caught. Then she flips to doggy, braces against the chair, and he grabs her hips hard — you can see the rug burn starting. Later, outside in the backyard at night, she’s making out with a dark-skinned guy near a fence covered in vines. Inside again, another scene with her on the floor in a dim room, kissing a brown-haired guy in a suit. The lighting keeps things moody — natural during the day, almost no light at night — but the camera stays close, especially when she’s taking it from behind.