" Some UFOlogists consider it a telling point that women who claim to have been sexually inactive wind up pregnant, and attribute their state to alien impregnation. A goodly number appear to be teenagers. Taking their stories at face value is not the only option available to the serious investigator. Surely we can understand why, in the anguish of an unwanted pregnancy, a teenager living in a society flooded with accounts of alien visitation might invent such a story. Here, too, there are possible religious antecedents. "

― Carl Sagan , The Demon-Haunted World: Science as a Candle in the Dark