Neuroendocrinology (SEX & GENDER) Part 1 with Daniel Pfau

Episode Summary

Executive Summary: This Pride-themed episode of Ologies uses neuroendocrinology to explain how sex, gender identity, and sexual orientation develop across biology, culture, and brain development. Guest Dr. Daniel Pfau discusses their own queer/trans experience, the harm of conversion therapy, gender terminology, and research suggesting sexuality and gender are shaped by complex, variable biological processes rather than simple binaries.

Main Topics: Queer identity, gender, and terminology (Priority: 5/5): The episode defines and differentiates queer, transgender, non-binary, genderqueer, cisgender, agender, gender fluid, and intersex, emphasizing that identity, expression, attraction, and assigned sex are distinct categories. Neuroendocrinology and brain development (Priority: 5/5): Allie explains neuroendocrinology as the intersection of nerves and hormones, and Daniel describes how brain and hormone development occur on different timelines with substantial individual variation. Conversion therapy and anti-queer harm (Priority: 5/5): Daniel recounts being exposed to conversion-therapy messaging through religion and psychology, and both speakers reject it as pseudoscience and emotionally damaging. Research on sexuality and same-sex behavior in animals (Priority: 4/5): Daniel summarizes research on TRPC2 knockout mice and other animal examples showing same-sex or nontraditional behaviors, arguing these behaviors are part of natural variation in biology. Biological sex vs gender identity and expression (Priority: 5/5): The show uses the Gender Unicorn and other examples to clarify that sex assigned at birth, gender identity, gender expression, and attraction can all differ, and should not be conflated. Queer visibility in science and academia (Priority: 4/5): Daniel describes difficulty being openly queer in conservative scientific settings and the importance of mentors and community spaces like Pride centers. Pride history and community support (Priority: 4/5): The episode honors Marsha P. Johnson and Sylvia Rivera, links Pride to protest against police brutality, and promotes the Marsha P. Johnson Institute through podcast donations.

Key Arguments: Sex, gender identity, gender expression, and sexual orientation are separate concepts and should not be treated as the same thing. Human brains are highly plastic, and development is shaped by many variable hormonal and neural factors rather than a single switch that determines identity or attraction. Conversion therapy is harmful pseudoscience and does not genuinely change a person’s orientation or identity. Same-sex sexual behavior appears across species, suggesting it is a natural and longstanding biological phenomenon, not an aberration. Because human biological development is variable and not binary, claims about a single "male brain" or "female brain" are overly simplistic. Visible normalization of pronouns and gender-inclusive language can help reduce stigma and increase understanding. Queer people in science often need explicit support, mentorship, and safe institutional spaces to thrive. Pride should be understood as rooted in activism led by trans women of color, not merely as a celebration.

Data Points: Age-related gender nonbinary identification among younger people: about 12% - Referenced from a study noting under-21 respondents identifying outside the gender binary Age-related gender nonbinary identification among older people: about 1% or less - Referenced from the same study comparing older populations Human loss of TRPC2 gene: ~25 million years ago - Daniel’s theory links the loss of a pheromone-signaling gene in primate evolution to same-sex sexual behavior Podcast donation recipients: 2 donations - The episode and next episode each support the Marsha P. Johnson Institute Older brothers effect: more older brothers = higher likelihood of being gay - Daniel cites this as one line of evidence in sexual orientation research Education path: BS, master’s, PhD - Daniel’s academic background includes animal sciences, biological sciences, and a PhD work on sex differences in mouse brains

Pivotal Quotes: "You can come as you are, but you won't leave as you came." — Allie Ward (quoting the church motto): Used to illustrate the religious environment Daniel grew up in and its anti-queer messaging "I study sex differences in the brain" — Dr. Daniel Pfau: Daniel introduces their research focus and the basis for discussing gender/sexuality biology "If we've been evolving with same-sex sexual behaviors for so long, then things like conversion therapy just simply don't make any scientific sense." — Dr. Daniel Pfau: Core argument tying evolutionary biology to the rejection of conversion therapy

Implications: The episode encourages listeners to separate biology from ideology, question binary assumptions, and support inclusive language and research. It also underscores the need for safer science spaces and continued public backing of trans-led advocacy.