Chris Williamson
@ChrisWill·4.2M subscribers·1 videos
Why Don’t You Have Sex With Your Sister? - Dr Debra Lieberman
Posted
January 3, 2026
Views
56,301
Likes
834
Comments
217
Engagement
1.87%
January 3, 2026
56,301
834
217
1.87%
Every word spoken in this episode is indexed. Type any phrase to jump straight to the moment it was said.
Type any word or phrase that may have been spoken. Click a result to seek the player to that exact moment.
Try a name, a topic, or a quoted line
1:08:30Now PlayingDr. 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…
Follow her work here:
-
-
New pricing since recordingFunction is now just $365, plus get $25 off at
Get 35% off your first subscription on the best supplements from Momentous at
Get a free bottle of D3K2, an AG1 Welcome Kit, and more when you first subscribe at
Get a Free Sample Pack of LMNT’s most popular flavours with your first purchase at
-
Get access to every episode 10 hours before YouTube by subscribing for free on Spotify or Apple Podcasts
Get my free Reading List of 100 lifechanging books here
Try my productivity energy drink Neutonic here
-
Get in touch in the comments below or head to...
Sentinel Indexing in Progress
Metadata and chapters are available. Claim extraction for this episode is pending.
All video content is delivered via YouTube embedded players in accordance with the YouTube Terms of Service. Sentinel provides research tools that promote discovery and accountability across political media.
