A little boy caught his mom and dad

A little boy caught his mom and dad having lovemaking.

After, he asked, “What were you and daddy doing?”

The mom said, “We were baking a cake.”

A few days later, the little boy asked his mom, “Were you and daddy baking a cake?”

She said yes, and asked him how he knew.

He answered, “Because I licked the frosting off the couch.”