Only two sex forms but multiple gender variants: How to explain?

Area of Science:

• Reproductive Biology
• Neuroendocrinology
• Cellular Physiology

Background:

• Classical biology often uses sex and gender interchangeably for animals, but this is inaccurate for humans (Homo sapiens).
• The existence of only two gamete types contrasts with the wide spectrum of observed reproductive behaviors.
• Existing explanations involve sex-determining genes and cognitive memory systems, but these are insufficient.

Purpose of the Study:

• To investigate the role of cellular calcium (Ca2+) homeostasis as a third factor influencing sex and gender.
• To propose the concept of 'Calcigender'—sex-specific Ca2+ homeostasis affecting gender-related processes.
• To challenge simplistic binary classifications of gender behavior.

Main Methods:

• Review of existing literature on sex determination, genetics, hormones, and cognitive systems.
• Analysis of Ca2+ physiology and homeostasis principles.
• Theoretical framework integrating Ca2+ homeostasis with gender-related behaviors.

Main Results:

• Identified sex-specific differences in cellular Ca2+ homeostasis as a significant, overlooked factor.
• Proposed that differential Ca2+ regulation, influenced by genetics and hormones, underlies diverse gender behaviors.
• Demonstrated that Ca2+ homeostasis principles can explain a personalized gender behavior in all sexually reproducing individuals.

Conclusions:

• Cellular Ca2+ homeostasis represents a crucial, yet underappreciated, pillar in understanding sex and gender.
• The 'Calcigender' concept offers a more nuanced physiological basis for the spectrum of gender behaviors.
• Current sociological categorizations of gender (e.g., hetero-, homo-, bi-, trans-) are overly simplistic and potentially misleading.