In "Strings" (2018) there is a sex scene between 2 puppets. This is because I watched the wrong movie and saw "Strings" (2004) instead. : r/shittymoviedetails
Strings - Rotten Tomatoes
Amazon.com: Strings - Fäden des Schicksals [Blu-ray] [2004] : Julian Glover, Derek Jacobi, Ian Hart, Claire Skinner, Jonas Karlsson, James McAvoy, Catherine McCormack, David Harewood, Samantha Bond, Marina Bouras, Anders Rønnow Klarlund,