Gelgamek

"Yes, and speaking on behalf of the Gelgamek Catholics, I believe we should move on to other solutions to this problem."

- Gelgamek Bishop

Gelgameks are an alien species and represent the Roman Catholic Church on their planet. They support sexual behavior with young boys, out of an apparent fear of their females and their natural course of procreation.

Physiology
The Gelgameks are amphibians with green slimy skin and large eyes. Their species exhibit a form of extreme sexual dimorphism, with females being almost nothing more than enlarged genitalia (and presumably other natural procreative apparatuses).

Appearances
They are seen at the Vatican in "Red Hot Catholic Love".

Source

 * South Park Archives