I do therapy with autistic patients. Because I am a male, I am usually assigned to work with the aggressive patients, while most of the female employees get assigned the easier non-aggressive patients. Many of the females earn comparable pay to my own or considerably more. I requested to transfer to another location within the company, and they denied my request, saying that because I was a male, they needed me at this location to work with the more difficult patients. I am offended and shocked. Is this legal?