Wikipedia explaind how the APA diagnose's T.F.....
Transvestic fetishism refers specifically to cross-dressing; sexual arousal in response to individual garments is fetishism.[2] A person who is diagnosed with Gender Identity Disorder should not receive a diagnosis of Tranvestic Fetishism,[2] although sometimes those with this diagnosis do go on to develop gender dysphoria, and then meet the criteria for a diagnosis of Gender Identity Disorder.[2] Most men who have transvestic fetishism do not have a problem with their assigned sex.
Some male transvestic fetishists collect women's clothing, e.g. nightgowns, babydolls, bridal gowns, slips, brassieres, and other types of nightwear, lingerie, stockings, pantyhose, shoes, and boots, items of a distinct feminine look and feel. They may dress in these feminine garments and take photographs of themselves while living out their fantasies. According to the DSM-IV, this fetishism has been described only in heterosexual men.
There are two key criteria before a psychiatric diagnosis of "transvestic fetishism" is made:[2]
Recurrent, intense sexually arousing fantasies, urges, or behaviour, involving cross-dressing.
This causes clinically significant distress or impairment, whether socially, at work, or elsewhere.
Thus, transvestic fetishism is not diagnosed unless it causes significant problems for the person concerned.
