The Dental Nurses (1975)

The office setting makes this threesome feel a bit dirtier than usual. A brunette in her 30s is the center of attention, sucking off a muscular dude while a blonde in her 20s watches closely. The blonde isn’t just sitting there — she’s actively involved, leaning in and getting her hands all over both of them. The camera switches between close-ups of the blowjob and wider shots to show the dynamic between the three of them. Later, the action moves to a desk, where the brunette rides the guy in reverse cowgirl while the blonde jerks him off from the side. It’s fast-paced but doesn’t skimp on the details.