It's actually the moment of disater in the film. He finally gets to fuck her and performs badly. From then on he spirals down because he beconmes obsessed while she makes it clear it is just casual fun in her eyes, and the summer is for fucking as many people as you like, not for falling in love. He is a man whose time is past, he learns this in the most painful way.
Storyline: Suntan (2016) For middle-aged Kostis, life has passed him by. As the newly appointed doctor of a tiny island, Kostis spends a dreary winter alone. By the time summer arrives, though, the island has turned into a thriving, wild vacation spot with nude beaches and crazy parties. When Kostis meets the beautiful and flirty Anna, he falls hard for her and goes out of his way to conquer and impress her. Before long, Kostis is spending nearly all of his time getting drunk, partying hard, and even making out with Anna. What starts as a rediscovery with his lost-long youth, though, slowly turns into an obsession as Kostis is willing to do whatever it takes to keep his Anna. Suntan celebrates the beauty and strength of the youthful body, while simultaneously embracing its inevitable decay.
I've always tried to have lasting power so as to satisfy a partner, but sometimes you run across a perfect sexy little minx like her and all self control goes out the window....