Go here to find out your "brain sex". No, not that, silly - whether your thinking patterns are more like men than women.
My results? My brain apparently thinks like the average man. That explains a lot.
The individual test results are kind of fun, too - how can I do worse than both men (7.9) and women (10.6) on the empathy test (6.0 for me), but still correctly identify 18 of 21 emotions on faces on which you see only eyes? I can read others' emotions, but just don't care?
The 12 of 12 right on the 3D shapes test is only because of quilting - thinking in three dimensions is a habit.
Anyway, it's a fun way to pass a little time. If you take the test, feel free to discuss your results in the comments.