Yes there are some criteria that have to be met by the person considering this very major step.
First the person must live as a member of the opposite sex, full time, for at least a year. After this, they would take either male or female hormones (depending on whether they wanted to become male or female) for at least a year - sometimes longer. These would soften body hair and cause breast development in men, and cause beard growth, a deeper voice and muscle development in women. Only after all this, they could have surgery to become a man or a woman permanently: a 'sex change operation'.
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