@mindpersephone @neil The counterexample here is airlines, which need to know the gender as written in the gender-marker field of the passport. Some ask this directly, but an increasing number ask for title, from a short list of something like Mr, Ms, Mx. They also say that this must match what is written in the passport. The problem is, my passport explicitly says that my title is Doctor, which is not one of their options (and which is gender-neutral, so wouldn’t help with what they want).The underlying advice of ‘ask for exactly what you have a legitimate reason to need’ still holds.