The Ultimate Lover (1986)

Blonde in a white lab coat goes down on a guy with curly brown hair while a brunette looks on — all in a medical-looking room with brick walls and equipment. The blonde sucks him deep, throat open, eyes shut, then lies back on the table so the brunette can eat her out. Later, the guy fucks the brunette doggy style on a bed in a different room, her ass bouncing as he pulls her hips back hard. The blonde joins again, riding him face to face, grinding slow then picking up pace. Hair gets messy, makeup stays intact, and the camera stays wide so you don’t miss anything. It’s straightforward porn — no fluff — just three people switching roles with zero hesitation.