Kiss Me Quick (1964)

Blonde milf with long hair and a tight body is bent over a metal structure, getting pounded hard from behind by a short brown-haired guy in his 20s. Another guy, blonde and in his 30s, stands close, jerking off and waiting his turn, face lit by the dim industrial glow. She switches to her knees and takes the dick deep in her mouth, eyes closed, cheeks puffing slightly with each thrust. The whole thing’s shot in tight close-ups and wide static angles — you see the full bodies in the bright lab room, then go face-first into the action during sex. They keep it raw and rhythmic, no breaks, no talking, just steady fucking and sucking. The pool scene at the end shows three girls in bathing suits — one brunette, one redhead, one blonde — but they don’t interact with the main couple.