A. A strong and persistent cross-gender identification (not merely a desire for any perceived cultural advantages of being the other sex). In children, the disturbance is manifested by four (or more) of the following:
repeatedly stated desire to be, or insistence that he or she is, the other sex
in boys, preference for cross-dressing or simulating female attire; in girls, insistence on wearing only stereotypical masculine clothing
strong and persistent preferences for cross-sex roles in make-believe play or persistent fantasies of being the other sex
intense desire to participate in the stereotypical games and pastimes of the other sex
strong preference for playmates of the other sex
B. Persistent discomfort with his or her sex or sense of inappropriateness in the gender role of that sex.
C. The disturbance is not concurrent with a physical intersex condition.
D. The disturbance causes clinically significant distress or impairment in social, occupational, or other important areas of functioning.
(picture source unknown - pulled from a LGBTQ blog from Sydney, Australia.
text from: http://pn.psychiatryonline.org/)