Well, sorta. That's where the official statement is, but the rationale sort of precipitates out of centuries of conversation and some disagreement -- including misunderstandings of embryology(!)
Here is the Encyclical Ineffabilis Deus
Here is the outline of the thinking in the Catechism.
Thanks Mad Dawg...good stuff. :)
Poor Aquinas always gets beat up on for his embryology!
Especially his bit about the female being an “occasioned” male. Sometimes, when I am feeling cheeky, I remind people about Y chromosomes. >:)
That helped alot ... thanks.