During an interview, Sebastian Stan and Denise Gough said they spent so much time running around Greece stark naked that they came up with a catchphrase for it: "It's Greece! Everyone runs around with no clothes on." Gough said they were able to get away with so much by filming the movie in Greece, especially the scene where they rode a scooter around Athens naked. She said there's no way they would have been allowed to do that stuff anywhere else.
For a club scene filmed on the island of Anti-Paros, locals were encouraged to participate as background artists, with posters put up around the town inviting any to come and join in.
Sebastian Stan (Mickey) opened up to The Wrap about the nudity and sex scenes in the movie by saying, "If it was truthful and made sense, then OK. Obviously trust was a big thing here," he said of going nude. "I knew we were trying to tell such an honest depiction of a relationship that we were going to be open to whatever that meant, as long as it remained truthful and made sense. I think, as long as everything felt earned... and it did. With every scene, not just sex scenes or the nudity, it's like, 'What's the most truthful thing here? They would be naked because they just did this. And that.' It always felt safe that way." Denise Gough (Chloe) also expressed her thoughts in her interview with Refinery29 by saying, "I initially thought I couldn't do the film was because of the sex scenes. It always falls to the actress to do all the sex stuff, so the orgasm, everything. So, I've never been interested in doing them. But then I watched Argyris Papadimitropoulos's film Nacktbaden - Manche bräunen, andere brennen (2016) and they have a different attitude towards sex in Greece. It just didn't feel like we were filming sex scenes. It's always going to feel a bit weird, but at that point we were so in the improvised world of that relationship, it was sort of okay. And Sebastian carried his side, so I didn't ever feel like I'm being filmed now, having sex. The camera just kind of moved around and we pretended. And then we jumped in the sea."