Elles s’éclatent au soleil (1979)

This starts with two female teens, one blonde with short hair and a slim build, the other with long brown hair and curvy, getting intimate with a muscular guy in their 20s. The outdoor scenes by the pool and in a field are pretty hot, especially when the blonde gives the guy a blowjob by the pool. Indoors, on a couch, the brunette has intercourse with him. There’s also a close-up of the blonde masturbating. The chemistry seems real, especially in outdoor scenes where they kiss and fuck in various positions. The camera captures everything pretty well, especially during oral sex scenes.