The Water People (1971)

Blonde with long hair and two brunettes, one with short hair, all slim and in their 20s, undress together on a bed in a dimly lit bedroom. The guy, muscular with short brown hair, gets sucked by the blonde in close-up — she’s gagging a bit, head bobbing hard, saliva dripping. One brunette goes down on him from behind while the other waits her turn, then they switch. He fucks one of the brunettes doggy style, then missionary, balls slapping loud each time he bottoms out. The camera stays tight during the oral, really shows the guy’s cock stretching her lips. You see all three women’s faces reacting, not just empty expressions — they’re actually into the pace he’s setting.