Seeds Of Lust (1971)

Fat guy with a mustache gets his dick sucked by a slim blonde milf wearing glasses — she’s on her knees, bobbing hard, spit dripping down his shaft. Camera catches the full sloppy sound of it, then cuts to the brunette joining in, both girls taking turns riding him on the couch. They switch to doggy style with the blonde bent over, ass high, getting pounded deep while the other girl lies back and watches. Lighting’s dim, mostly shadows from a lamp, gives it that lived-in motel room vibe. The sex feels rough but unstaged — he’s grunting, they’re not faking the gag reflex when he thrusts too far. No fancy moves, just raw three-way action with a focus on facial expressions and cumshot close-ups.