"Taste Test" joke

A teacher was having a tasting day where she would put candy in the kids' mouth and they would guess what it was.

She went to the first little boy and put a Hershey's Kiss in his mouth.

"Can you guess what it is?"

"I don't know," said the boy.

"I'll give you a hint. It's something your daddy asks your mommy for every morning."

The girl next to the boy says "Don't eat it. It's a piece of ass."