I read the davinci code a while back and Langdon described the fingers behind the head refferencing some god of sex, he had a goat head and such. Some other stupid religion translated that horns from that god to the devil and him having horns. One group of crusading dudes sided with this religion and had some ceremony thing to do with the head, and the public started thinking them as worshippers of the devil. People now unknowingly put the fingers behind the head as horns to represent so, but unwittingly promoting the victim of having a high sperm count. if you did that to a girl u should apologize :D