My first daughter SweetPea was a very late talker, and this gave me ample space to learn to curb my potty mouth. In my defense, I worked first with sailors and then with a journalist; both seemed to embrace the abundant use of expletives on a daily basis.
Say what you want about how you wouldn’t have fallen prey, stick a person in a room for a week with an up-talking teenager or former valley-girl, and I assure you they will be infected by these atrocious and highly contagious conditions. Swearing is no different.