Gender cannot be “switched.”
No matter how many X-chromosomes there are, any individual with the Y-chromosome is male. No person is "transgendered," nor can any person have a “sex change;” it is disfigurement and erroneous terminology.
Any hypothesis of a "gay gene" is duplicitous fallacy. Homosexuality: a birth defect, mental illness or choice? Logic?
There are genetic abnormalities/defects, but these are not procreant genotypes: XO (Turner syndrome), XXY (Klinefelter syndrome), XXX (poly-X syndrome), and XYY (Jacob syndrome). No matter how many X-chromosomes there are, any individual with the Y-chromosome is male. These anomalies are so few, only one in several thousands occurs.
Would sex change be more accurate? He the complete operation, and I mean complete.