Sentence:  Therefore, regardless of whether there is a physiological cause of or predisposition to the desire to change sex, I don't think such a cause or predisposition can consistently be required by the rejecter in order for <WSD>transracialism</WSD> to be legitimate. 
Meaning of the word marked with <WSD> tags:  The quality of being transracial, or identifying as another race than the one that one was born into.