I really dislike this whole discussion of 'disclosure' - it's bloody obvious in person what sex someone is. This whole idea that no-one will tell unless told is unmitigated bollocks. Of the male variety. It's lying, pretending no-one can tell is lying. It's framing this whole discussion from the point of view of biology / reality denial and gender ideology.
Dogs can tell male and female humans apart ffs. What happened to not lying in court?
I also don't see why, if a service user needs single sex for trauma based reasons (which will be a lot of them) then why they can't just assign someone of the same sex. There is no need for anyone to be 'outed'.
In the case of transmen, I think there is a need for nuance. You could argue that someone who is trying to identify out of their sex and does not acknowledge sex as material reality maybe has such personal bias that they cannot appropriately provide a service to someone who's been raped. It seems to me a bit like asking someone who's a signed up member of the BNP to provide counselling to refugees who've been victims of racism.
I am sure many transmen acknowledge the difference between sex and gender and that both matter, but if any counsellor is unwilling to accept the fundamental lived experience of a service users trauma how can they help them? They can't. It becomes abusive and retraumatising as soon as they ask that person to deny their reality.
Any rape counselling service which doesn't acknowledge sex as a material reality, as a protected belief under EA2010 (under both sex and religion / belief) and refuses to listen to victims needs should be defunded immediately.