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

Dr. Debra Lieberman is an evolutionary psychologist, professor, and researcher.

Why don’t we feel sexual attraction toward our siblings or close family? Evolution seems to have hard-wired the brain to prevent inbreeding, a pattern shared with many other animals. So how does this mechanism work, and what are the moral or ethical arguments surrounding incest?

Expect to learn why evolution has designed you to not want to have sex with your sister, how animals actually detect who their relatives are, what the high level explanation is for why humans don’t want to have sex with their kin, the moral argument if it is okay for two adult siblings had consensual sex, how big the actual genetic risk is for first cousins, what crying and tears actually communicate from an evolutionary perspective and much more…

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0:00 Why Don’t We Want to Have Sex With Our Siblings?
7:57 What Cues Trigger Our Incest Avoidance Mechanism?
19:04 Is Incest Disgust a Moral Pressure?
27:19 How Only Children Make Sense of Incest
31:11 Why Is Incest P**n So Popular?
37:19 Why Do We Cry?
52:53 What Happens When No One is Watching
58:07 Why We Use Tears to Convey Emotions
01:06:30 Where to Find Debra

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