https://www.theguardian.com/science/2018/mar/20/testosterone-myth-male-hormone-behaviour-risk-taking
I am only too happy to confirm the findings.
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Its a good article, but a shame they didn't talk about how happy men were, or not, with lower testosterone.
The article is a promotion for his new book, so perhaps there's more in there.
Chapter 4 in the book covers some transgender issues, but I can't say I found it very interesting.