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Francis (Sid) Dougan Profile picture
Francis (Sid) Dougan
@F_Sid_Dougan
Call me Sid. Evolutionary Psychology PhD student (The @ProfDavidBuss Lab). Zoology/Biology MSci (University of Bristol, UK). 🇬🇧British chavvy in America🇺🇲
Sep 22 • 16 tweets • 5 min read
🧵 1/15 - "THERE ARE ONLY TWO SEXES AND THERE CAN NEVER BE MORE" - my publication in Archives of Sexual Behavior.
Thread with link and very brief summaries of the main points I cover in the paper...Image link.springer.com/article/10.100…

2/15 - Biologically, sex is determined by gamete type: females produce large gametes (eggs), males produce small gametes (sperm). This definition applies at the level of phenotype. Infertile, prepubescent, or post-reproductive individuals are still male or female, because they belong to a sexed phenotype evolved to produce one gamete morph. They do not contradict the gamete-based definition of sex.
I do not focus on 'gender' or 'identity' in this paper.