Ancient Maya scarified boys not virgin girls: study | Science | Reuters

"The victims of human sacrifice by Mexico's ancient Mayans, who threw children into water-filled caverns, were likely boys and young men not virgin girls as previously believed"

"He said children were often thrown alive to their watery graves to please the Mayan rain god Chaac. Some of the children were ritually skinned or dismembered before being offered to the gods, he said. "It was thought that the gods preferred small things and especially the rain god had four helpers that were represented as tiny people," said de Anda. "So the children were offered as a way to directly communicate with Chaac."

I think ya gotta love people with a good enough relationship with a god to call him Chaac. In most cultures the people would have to call him Charles.