Hi, Alyssa,
I got several gender tests including cogiati. Some say I am transsexual, and others say I am androgynous. A few people suggested me to visit and consult with a professional doctor, but I did not, because I believed I can control and manage my own life. I do not need any more gender tests.
Math? I agree with you that nowadays the sexual difference is diminishing. We have many brain games such as chess and go. Nowadays, there are a few outstanding professional female go (baduk) players in my country. Girls tend to be less interested in math once they arrive at puberty. Women generally are better in language than men. Of course, this is just a trend, and there are many exceptions. In the case of America, I am not quite sure, but I guess the trend you mentioned may indicate that American boys have become less interested in math, or departments of math in colleges have became less addractive for getting nice jobs. I once volunteered to help teach math in a American class of 4-th grade about 10 years ago, and the most outstanding student there happened to be a black boy.
When I do research and math, I become less interested in fashion.
Barbie~~