I know "male, female, FTM, MTF, other" is a standard gender/sex question, but I don't know why. A problem is that it implies that "FTM" is a distinct category from, rather than a subset of, "male" (ditto for female).

Is that a standard gender/sex question? As someone who's been programming market research surveys for several years, I've never seen anything like it.

Yes, as someone with no skin in the game, so to speak, I was nonetheless uncomfortable disclosing not just the gender "male" but also the initial state of my genitalia. What kind of person asks about a baby's junk?