Gender Confusion

I recently wrote an application that required the user to specifiy their gender. You know, M = male, F = female. Right? Wrong. I was shocked to find that, according to FBI, gender was a little more complex.SEX 2.024- SEX.This field is used to report the gender of the subject. The entry is a single character selected from the following table:If Following Condition Exists

F=Subject's gender reported as female
G=Occupation or charge indicated "Male Impersonator"
M=Subject's gender reported as male
N=Occupation or charge indicated "Female Impersonator" or transvestite
Y=Male name, no gender given
Z=Female name, no gender given
X=Unknown gender