Rosa Avila in nude scene from Intercambio de parejas frente al mar which was released in 1978. She shows us her tits, butt and bush including full frontal nudity in explicit sex scene.
Also Agata Martin naked in Intercambio de parejas frente al mar. We can see explicit sex scene with her. So Agata Martin is not shy and she demonstrating her ass, boobs, bush and even full frontal nudity.
In addition there is explicit sex scene with nude Ana Bernal. Thanks to Ana Bernal for her tits, butt, full frontal, bush and other sexy shots in that video.