The Neuroscience of Desire, Dopamine, and Orgasm ft. Dr. Jim Pfaus

Dr. Jim Pfaus is a behavioral neuroscientist who has spent decades watching rats have sex to understand what's happening in the brain during desire, arousal, and orgasm. I talk with Jim about what that research can teach us about our own desire, and just how much of it comes down to the brain rather than any one hormone. We tend to assume females have little say in when sex happens, but Jim's research shows the opposite in female rats. They have complete control over whether it happens at all. He also shares a study on partner preference: when a male rat has to wait for one specific female instead of getting instant, easy access to her, he'll seek her out over other females afterward. When there's no wait, that preference never forms. We also get into what dopamine and serotonin are doing during arousal and orgasm, why SSRIs can shut down desire and what can sometimes be adjusted, and the real relationship between testosterone and estrogen in both men's and women's bodies. Jim also explains what might be happening in the brain when GLP-1 medications affect libido, the inverted U-shaped curve behind arousal and performance, how early experiences condition what turns us on for life, why pain responses in conditions like PGAD and vestibulodynia are so hard to fully unlearn, and what his research suggests about psychedelics and sexual connection.What You'll Learn:Why sex is a behavior generated by the brain, not just a matter of hormone levels.What decades of studying rat sexual behavior reveal about desire and consent, including how female rats have complete control over whether sex happens.Why male rats only form a preference for a specific partner when she isn't simply available on demand, and what that suggests about waiting and anticipation.How dopamine drives attention and wanting, and why it drops sharply after orgasm.What serotonin does to desire and orgasm on SSRIs, and how dosing can sometimes be adjusted.The real relationship between testosterone and estrogen in both men's and women's bodies.What might be happening neurologically when GLP-1 medications affect libido.The inverted U-shaped curve, and why some people need more stimulation while others need less.How early sexual experiences can condition lifelong arousal patterns.Why pain responses like PGAD and vestibulodynia are so difficult to fully unlearn, even after the physical cause is treated.Get in touch with Jim:LinkedInGet in Touch with Me:WebsiteInstagramYoutubeSubstackPreorder my book