This part was a jarring note in Three Worlds Collide for me, but for a different reason. If these people grok evolutionary theory so much that they can infer the evolutionary reason for an alien species' Baby-eating behavior within the course of a day, and also evolutionary psychology concepts like "superstimulus" have permeated to be part of everyday language, then why do they have trouble understanding why unwanted sex might be a cause for discomfort? I can accept societal attitudes towards it changing given sufficiently advanced technology, but that people wouldn't UNDERSTAND why it was once proscribed just breaks immersion for me.