Simple

[marval]

A six year old girl came home from school and said to her grandmother, “Grandma, guess what? We learned how to make babies today."

The grandmother, more than a little surprised, tried to keep her cool.

"That's interesting," she said, "How do you make babies?"

"It's simple," replied the girl. "You just change 'y' to 'i' and add 'es'."

[Old_Geezer]

That's where I've been going wrong !
I've been tying to add an XY to an XX.

[Answerprancer]

LOL...reminds me of this:

http://www.youtube.com/watch?v=gd3oYFS9g9I