Sorry, but it's not only the "APA" the "GLAAD" also has a say in this..
Cross-Dressing To occasionally wear clothes traditionally associated with people of the other sex. Cross-dressers are usually comfortable with the sex they were assigned at birth and do not wish to change it. "Cross-dresser" should NOT be used to describe someone who has transitioned to live full-time as the other sex or who intends to do so in the future. Cross-dressing is a form of gender expression and is not necessarily tied to erotic activity. Cross-dressing is not indicative of sexual orientation.