Mom and Dad (1945)
Mom and Dad (known as The Family Story in the United Kingdom) is a feature-length 1945 film directed by William Beaudine, and largely produced by the exploitation film maker and presenter Kroger Babb. Mom and Dad is considered the most successful film within its genre of "sex hygiene" films. Although it faced numerous legal challenges and was condemned by the National Legion of Decency, it went on to become one of the highest-grossing films of the 1940s.
More at Wikipedia.