Well, I think they want to know your sex.
>>
>> http://www.tsa.gov/travelers/airtravel/acceptable_documents.shtm
>>
>> But they are too stupid to call it that.
>>
>
> No, I think it's that "sex" is rude and "gender" is politer.
>
Or that no one would think to write in "yes, please" for gender.
-- "Hige sceal þe heardra, heorte þe cenre, mod sceal þe mare, þe ure mægen lytlað."