That said, I think testosterone and related hormones may yet be found to play a bigger role than BMJ editorial mentioned in the last sentence states. I support the right of trans women to play competitive women’s sports BUT it would be evidence of an unfair non-natural advantage if the participation rate of trans women in these sports was significantly higher than the incidence of trans people in the community generally. The obvious solution is to tweak the hormone levels required for trans female athletes to levels where only the very best trans women will be competitive with cis players (who themselves are high performance athletes), and these levels need not necessarily equate to the levels found in cis women.