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Main character of this movie is Rene Rupnik, a former math teacher. He is forty years old and lives together with his mother in a desolate block of flats. Ever since his early youth women with big breasts have fascinated him, because they symbolise a kind of earth mother to him. He has never had an especially close relationship with his own mother; she was too 'bony' for him. Object of Rene's fantasy is the actress Senta Berger, to him everything a woman should be. Standing by the blackboard and explaining the mathematical laws of sine and cosine ('sinus' is bosom in Latin), Rene sings the praises of the female curves and those of Santa Berger in particular. Filmmaker Ulrich Seidl let the former teacher speak freely about his obsessions and desires, intercutting his monologues with scenes from the protagonist's day-to-day life.

How to Watch Der Busenfreund Legally and Safely

If you want to stream Der Busenfreund through reputable and legal services, there are a few good options depending on where you are. Subscription platforms like HBO Max, Disney+, Netflix, Amazon Prime Video, and Apple TV+ sometimes carry Der Busenfreund films or related DC titles—though availability depends on your country.

If you’d rather not commit to a subscription, there are ad‑supported, free (but legal) platforms such as Tubi, Pluto TV, Peacock or Crackle (where available in your region) that occasionally host superhero films.

Lastly, don’t forget about library‑linked streaming options like Kanopy or Hoopla (if your library or university is registered), and official uploads by film distributors on YouTube—these can also give you legal access to classic movies.