The problem is that the OP, for all she has good intentions, has probably never considered the impact of forcing women into a gender box when what they should be answering is a question about their sex.
It's such a loaded question that any answer will be a bad fit for many feminists.
It's the classic "have you stopped beating your wife, yes or no?" trap
I do sympathise with a newbie wandering in to a place of ideas they may not have considered before, but to post asking for respondents to a survey, and then when people explain why the survey is loaded from the start in such a way as to be impossible to truthfully complete, a more gracious response might have been to stick around and understand why, possibly learn how not to exclude your target market, rather than ignore and instruct us not to bother if we don't want to.
The point is that many of us would in fact like to help, but CANNOT truthfully answer questions that are restricted to gender this way.
Vegetarians: what is your favourite meat:
Lamb
Chicken
Other
Fine, don't answer if you don't want to, but I'm trying to be inclusive of meat eaters here in my study on vegetarianism.