What is transvestism?
Transvestism is a paraphilia. According to the DSM 5, there is transvestic disorder, when there have been "Over a period of at least 6 months, recurrent and intense sexual arousal from crossdressing, as manifested by fantasies, urges, or behaviors." "The fantasies, sexual urges, or behaviors cause clinically significant distress or impairment in social, occupational, or other important areas of functioning."
Two forms of transvestism
There are two forms of transvestism. For some transvestites, crossdressing is necessary to feel sexually excited. Others only feel the need to crossdress during periods of stress. The rest of the time, their sex life does not necessarily involve crossdressing.
Is this disorder more frequent in men or women?
This disorder nearly exclusively concerns men, men using women's clothes. One of the reasons of this gender difference is that in Western societies, it is very common for women to dress in a way which is influenced by menswear, whereas the opposite is not true.
List of paraphilic disorders