Rape is the only crime on the books for which arguing that the temptation to commit it was too clear and obvious to resist is treated as a defence. For every other crime, we call that a confession.
The short involves Goofy doing domestic chores for his wife, which was an odd concept in the 1950′s. So based on the Milkman not knowing who he was kissing in this bit, it implies that Goofy’s wife was fucking the Milkman.