Grandma and Sex

My 10 year old son and my mom have a great relationship. They are very much alike; conservative old souls who were born in the wrong era. One day they were shopping for a greeting card. The purpose of the card was to get the best non birthday card for someone at my mom's job. She asked my son (at that time 7 years old) to help her pick out a funny card.

As they began their search for the funniest card my son gasped and grabbed a card. "Grandma" he exclaims, "you can't read this card. It has a bad word in it." Curious at what type of profanity would be on a card in this convenience store, my mom asks what word. "Sex" he replies and then covered his mouth. My mom is trying to figure out what he actually thinks sex is so she plays dumb and says "What is sex?". My son says "I can't tell you." My mom begs him to tell her, promising him he won't be in trouble so he leans in and whispers "Sex is when two married people lay in bed and kiss for a long time. They lay there and kiss for a loooooonnnngggg time."

And there it was.