[Jaye]

Y chromosome does not equal male. In most cases it does but you can't make a blanket assumption that sex is entirely determined by chromosomes because it is not.

[menacingly]

Yes it does.

[agateform]

Watch the last 3rd of this Stanford University lecture on Human Sexual Behavior http://youtu.be/LOY3QH_jOtE (I think the relevant part starts at 1:13)

I think Jaye might be right.