In the Realm of the Senses ( Ai no corrida ), by the always provocative Japanese director Nagisa Oshima, remains one of the most controversial films of all time. Based on a true incident, it graphically depicts the all-consuming, transcendent—but ultimately destructive—love of a man and a woman (Tatsuya Fuji and Eiko Matsuda) living in an era of ever escalating imperialism and governmental control. Less a work of pornography than of politics, In the Realm of the Senses is a brave, taboo-breaking milestone, still censored in its own country.
You can stream In The Realm Of The Senses (1976) free and legally on OldReel, via the Internet Archive.
Yes — it is in the public domain and can be watched and shared freely.