As Delicias da Vida (1973)

This threesome scene features two white girls and a white guy, all in their 20s. One of the girls has long brown hair, while the other is a blonde with a slim, petite build. The brunette has a curvy figure and big breasts. They start with some oral action, taking turns giving each other blowjobs while the guy watches. Then, things get more intense with the blonde riding the guy in a cowgirl position while the brunette joins in for some girl-on-girl action. The camera captures everything up close, making it easy to see the details of their fucking. At one point, the brunette is on her back with the blonde on top, grinding away.