or "Lass jucken im Heu". A completely silly sex comedy from the 1970ies.
At the happy Willard ranch, a moonshiner father decides to teach his son a lesson or two about women, however, no one can come between Junior and his Sassy Sue.
There's a pretty decent scene for the butt aficionados there, but no spanking.
Clip: https://mega.nz/file/EBAFkToZ#VMkU8-jkF ... b7MS63csHk
IMDB: https://www.imdb.com/title/tt0147337/