#1041 - Dr Debra Lieberman - Why Don’t You Have Sex With Your Sister?

In this interview, Chris Williamson and Debra Lieberman delve into the evolutionary reasons behind incest avoidance, exploring how humans and animals detect genetic relatives and the roles of cues like breastfeeding and co-residence in triggering aversion. They discuss the Westermark effect, genetic sexual attraction, and moral dumbfounding, and also transition to the evolutionary purpose of crying, with Lieberman explaining her theory that tears are a tool used by the lower-leveraged to communicate value and negotiate costs in relationships, and the conversation touches on the nuances of crocodile tears and the potential for tears to recalibrate emotional states.