Robert Sheehan & Rory Culkin in The Song of Sway Lake (2018)

The Song of Sway Lake centers on Ollie (played by Rory Culkin), a music collector who goes to his family's abandoned estate looking to find a 78 record, with the help of his friend Nikolai (played by Robert Sheehan), a Russian drifter. His efforts are stalled upon the arrival of his grandmother Charlie, who befriends Nikolai, who develops a connection with her past and deceased husband Hal. Robert appeared in various states of undress throughout the film, showing rear and frontal nudity. Rory doesn't get naked, but appears shirtless in a few scenes. There's also frontal nudity from the actor swimming naked in flashbacks to Charlie's time on the lake with Hal.