Valentine's Day - S1.E20

For Valentine's Day, Carol decided to surprise Paul by getting her tubes tied so they don't have to worry about having another baby. However, Paul's gift to Carol is getting a vasectomy. He talls Jack, Jack tells Marilyn, and Marilyn tells Carol. When Carol finds out, she decides not to have her tubes tied.

However, when Barb drives Paul to the doctor to get the vasectomy, he chickens out and the two are having sex without birth control unknowing. After a test, Carol learns she's not pregnant.