Transvestic fetishism
From wipipedia.org
Transvestic fetishism refers to those males who get a sexual thrill from dressing in clothes of the opposite sex. They are predominantly heterosexual. There are also males - sometimes called 'girly boys' - who may dress in a feminine way through choice rather than for sexual stimulus. Many of them are bisexual. There are also 'transexuals' who appear to be convinced that they are 'female inside' and may undergo surgery to become partially or wholly 'female'. Most of them are (from their male gender) homosexual.