The full story is that testosterone isn’t just for puberty. Testosterone differences between people with XX and XY chromosomes start in the womb and continue during the first half-year of life. These differences are associated with cognitive, emotional, behavioral, and body composition dissimilarities that may affect how each plays sport in later life.
Perhaps a more complete understanding of testosterone’s influence from the womb will help resolve some points of contention in the Trans conversation.
Testosterone levels can be affected by social, economic, and biological factors in an individual’s life. To eliminate such variables, Patel studied twins in utero. In particular, he compared opposite-sex and same-sex twins…
Based on Patel’s research of twins, males who had higher levels of testosterone available to them in the womb are more likely to go on to be self-employed.
They are also more likely to play full contact sports like rugby or football and to work in financial services careers. In general, more testosterone is associated with lower levels of risk aversion, so people with more testosterone may take more risks. (Emphasis added.)
No wonder guys kick so much ass when they play girls sports
Delusions of Adequacy 