>>>>>Here is - hopefully a humorous - reply to your paper form example. Imagine that on the paper forms they would have a check box and the word "Male" and nothing else. So if you don't check it, you are a Female, pretty obvious. But imagine how many questions or raised eye brows this would generate :).
>>>>
>>>>That's why there's generally two checkboxes for that particular question! <g>
>>>>
>>>>~~Bonnie
>>>
>>>I think there is a dropdown for this question (Male/Female/Unknown)
>>
>>I meant two checkboxes on the paper form. ;0)
>>
>>~~Bonnie
>
>Hmm...
>Males would check the "Male" checkbox
>Females would check the "Female" checkbox
>Hermaprhodites would check both the "Male" and "Female"
>Entities that are neither would leave both unchecked...
>
>Hmm... That should cover it... At least until we encounter beings that have additional genders...

Maybe NULL for unknown?