Lúcia McCartney, Uma Garota de Programa (1971)

Lucia McCartney’s the girl here — slim, fit body, long blonde hair, blue eyes, that natural pretty look that works whether she’s dressed up or completely naked. She starts off alone in a bathroom, close-up shots of her face through the shower curtain, looking like she’s getting ready for a client. Next scene shows her wrapped around a younger dude in a bedroom, both of them going at it hard — full-on humping, deep kissing, grinding before the clothes come off. You see her riding him on the bed, slow at first, then picking up pace with her hair swinging side to side. Later she’s on the couch with an older guy, brown curly hair, average build, talking low, then transitioning into more action — him eating her out, then her giving him a blowjob while the camera stays tight on her face and mouth. There’s also a brief club scene at the end, silhouette-style, likely setting up another encounter, but the focus stays on Lucia through the whole thing. The way she moves — confident, loose, not faking — makes the sex feel real, not staged.