Can your dick touch your asshole? (NSFW language)

There once was a little boy who lived with his grandparents. One day the boy walked up to his grandfather who was smoking a cigar.
"Hey grandpa, can I have some of your cigar?" He asked.
"Can your dick touch your asshole?" the grandfather replied.
"No"
"Well you can't have any."
The next day the little boy went up to his grandfather again who was drinking some vodka. The little boy asked, "Grandpa, can I have some?"
The grandpa says, "Can your dick touch your asshole?"
"No" says the boy.
"Well you can't have any."
About a week later the little boy is eating some cookies on the front porch. The grandfather comes out and sees the little boy eating. Seeing the opportunity to have a treat the grandfather asks, "Hey, buddy, I see you've got some cookies there. Do you mind if I have one?"
The little boy looks at him and says, "Can your dick touch your asshole grandpa?"
The grandfather smiles and says, "Well yes, of course it can."
"Well go fuck yourself grandpa, grandma made these for me."