Kate Bornstein theorized about gender and was also an author who changed gender through surgery from male to female. Kate was not comfortable with the assumption that there were only two genders and firmly believed that there are more than one genders and a person could change his gender at any time.
Therefore, according to Kate Bornstein's Gender Outlaw, the option that is not a "rule of gender" is a. there are two, and only two, genders
