Tina Makes A Deal (1973)

Starts with this MILF-looking dude in sunglasses talking on the phone—total power move. Then the scene flips to two slim brunette girls, one with shoulder-length hair, the other with long dark waves, just hanging out in a living room. They’re both petite but the one with the long hair’s got a nice little ass that gets a lot of attention later. The action kicks off when the guy joins them, already naked, and starts feeling up the first girl’s tits while the other one watches. She’s into it, spreading her legs so he can finger her right away. They move to the bed, and the long-haired girl gets on top, riding him slow at first, then picking up speed. The other girl kneels beside them, getting her pussy eaten while she jerks him off. The camera’s right there for the close-ups—you see everything. Switch to doggy, and the MILF dude’s really going at it, slapping her ass hard enough to leave marks. The second girl’s still in the mix, making out with the first one between positions. No awkward pauses, just non-stop action with all three of them involved the whole time.