Nor is there any convincing evidence that sexual orientation is biologically determined; rather, research tends to show that for some persons and perhaps for a great many, “sexual orientation” is plastic and fluid; that is, it changes over time. What we do know with certainty about sexual orientation is that it is affective and behavioral—a matter of desire and/or behavior. And “gender identity” is even more fluid and erratic, so much so that in limited cases an individual could claim to “Identify” with a different gender on successive days at work. Employers should not be obliged by dint of civil and possibly criminal penalties to adjust their workplace to suit felt needs such as these.
Paul McHugh and Gerard V. Bradley, “Sexual Orientation, Gender Identity, and Employment Law”