Some university student girls get spanked in a dorm in "宇能鴻一郎の 修道院附属女子寮"(lit. UNO Koichiro's Abbey's women dormitory) released in 1981.
It is one of the Nikkatsu Roman Porno series.
We can get full movie on DMM and short movie on FC2 link below
http://video.fc2.com/a/content/20081123ttSv6Qsx/&otag=1&tk=TWpnNE5ETTBNVGM9