reminds me of a VERY old joke....
Two little children went with their parents to the breeder to pick out a puppy. Their parents wanted a little boy puppy.
The breeder was carefully picking each puppy up and looking at the underside to see if it was a boy or a girl. One of the little children asked, "Mom, how can she tell that it's a boy by doing that?"
The other one piped up...."It's stamped on the bottom, silly!"