15/365 Ai no korîda

Highly controversial, and in some countries banned as it was regarded as too pornographic for the censors.  A story of sexual obsession in Japan in 1936, based on true events. Warning - it is very explicit.

Cert: 18

UK Release: 1991 (original Japanese release 1976)

More info: http://www.imdb.com/title/tt0074102/

Note: The director, Nagisa Oshima, died today, which is why I chose this film. Read The Guardian's obituary.