The point is that male female and man woman and boy girl are detached from biology.
So you have a sex 'assigned' at birth (rather than observed).
Girls or boys can have periods or erections.
The body is irrelevant, immaterial. A 'social construct'.
Men can give birth, women can have penises.
Linking man/ woman/male/ female with sex organs or different physiology is offensive.
All that matters is how you feel inside. There is no pre-requisite to want to alter your appearance/ body. If you say you are a man/ woman then you are. Full stop. In fact, saying an obvious male wearing a suit with a beard who is 6'5 for eg is transphobic. Policing women's appearance is a terrible thing to do. (Feminism subverted).
All single sex things including prison sport etc should accept declared gender full stop.
Eg male rapists with working penises in women's prisons is fine. They are women if they say so, so cruel to put them in with men. Even if look like men. Rationale. Women commit sex offences too. If there are risks then they should be assessed and dealt with.
Etc etc