This is a Polish biopic that is distributed in English as “Kulej: All That Glitters Isn’t Gold.” The Guardian called it “Poland’s answer to Raging Bull.”
The story of Jerzy and Helena Kulej, the most vibrant married couple of the 1960s in Poland. He is a legendary boxer, a two-time European and eight-time Polish champion, the only Polish boxer to have won two Olympic golds, and though never knocked out in the ring, collapsing many a times in his private life. She is a strong woman, always there by his side, but refusing to stay in his shadow forever.
In this scene Kulej sees a woman taking a shower through the bathroom door, with her back turned to him. He mistakes her for his wife, but in reality it was a student taking care of their son.
Monika did full frontal and rear nudity in episode 2 of Uncertainty