Interview

One day a boy named Joe was at school. For his homework he had to interview a family member. He decided to interview his mother. He came home and said "Mommy i have to interview you for school." She said okay and lets him proceed to ask her questions. The first question was how much do you weigh. The response was ladies don't tell their weight. He said "okay" and asked "how old are you?" His mother said, "Ladies don't tell their age." She said, "You can ask me one more question." He said, "Mommy why did your marriage fail?" She replied, "That is none of your business, go interview some around the neighborhood. "I have to get some things done."
The next day.....
Joe comes home and says, " Mommy i got an A+ on my homework." She says "Really. Who did you interview?" Joe replies, "You." "Last night when you were sleeping, i went through your wallet and got your driver's license. You are 42, 150 pounds, and the reason your marriage failed was because you got an F in sex."