There are spanking scenes in the "Tyotto Kawaii Aian Meiden(a quite cute iron maiden)" ,R15 Japanese Movie,released in forthcoming july 19 2014.
映画「ちょっとかわいいアイアンメイデン」予告編 投稿者 ironmaiden0719
This film seems to be based on FUKAMI Makoto's Manga that has the same title.
The story focuses on some school girls and theier club activities.
In their school they have the Torture club and in this club they have might studied and indeed done torture.
So through this club activities they get a spanking.