[hasmolo]

gender and sex are not correlated. one is a preference and the other a biological status. gender indicates to people where you view your place in the social structure, sex describes your physical or hormonal status

(not one to one correlation, good points)

[ceejayoz]

They're absolutely correlated. The correlation coefficient isn't 1.0, though.

[mbg721]

I don't think "correlated" is the word you're looking for here.