DNA: XY or XX isn't necessarily gender selector

I heard it on radio last night and googled news but only found one link "Gender gene identified: Mutation that caused skin disease is found by scientists to determine whether embryo will develop a uterus."

You can have XX chromosome [normally female] and still become full, real man:

With two copies of the X sex gene, these brothers and the other man in the study should have been female. But nothing about them indicated that they were anything other than male. They grew from boys into men and each married. But they were all sterile and at high risk for skin cancer.

My wife brought out an interesting idea: maybe there is a gay gene after all [e.g., XX males having interest in XY (or XX) men]! Very interesting study....

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