If you give as many options as possible, it can get ridiculous after a while (I remember seeing a form where the "what do you ID as" section took up more than half page with options like: Male, Female, Intersexed, Transgendered, Queergendered, FtM, MtF, MtM, FtF, ItF, ItM, ItI, Boi, FemmeBoi, and so on...)

Even if the choices given are confusing to me... if a survey creator thinks to put ANYTHING other than just the binary M/F option, I'm usually pleased to see that they are aware and trying to be inclusive.