rape in japanese movies

[pierre gedalge]

I would like to have your opinion on the importance of rape in japanese movies.
In such differents movies (different directors and times), there are rapes:
kurosawa akira 1950 rash?mon
oshima nagisa 1960 seishun zankoku monogatari (contes cruels de la jeunesse)
teshigahara hiroshi 1964 suna no onna (La femme des sables)
imamura shohei 1964 akai satsui (d?sir meurtrier)
masumura yasuzo 1966 akai tenshi (l'ange rouge)
oshima nagisa 1975 l'empire des sens ai no korida
takabaysahi yoichi 1982 esprit de tatouage ou la femme tatou?e
and lots of others
And those movies are not pink eiga or roman porno. So how explain that?

                                             Pierre Gedalge
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http://pgedalge.phidji.com/  the searchable database on japanese movies