A woman and her little boy were walking through a park in New York and they
pass two squirrels having sex.

The little boy asks his mom, "Mommy, mommy,
what are they doing?"

The lady responded, "They're making a sandwich."

Then
they pass two dogs having sex and the little boy again asks what they were
doing.

His mother again replied they were making a sandwich.

A couple of
days later the little boy walks in on his mother and father and said "Mommy,
Daddy, you must be making a sandwich because, Mommy has mayonnaise all over
her mouth!!!"