The condition is incredibly painful, and drives transsexuals to correct the error by having their bodies resculpted to match their brains. There are equal numbers of both. Transsexuals know what is wrong with them essentially from birth, but often deny the fact because of social pressures. Transsexuals are rare, at around 1 in 30,000 people. A transvestite is a person, almost always male, who feels sexual excitement dressing up as the opposite sex.
Transvestism is a sexual fetish, a kinky thrill that generally develops sometime after puberty.
Transgenderist A transgenderist is a person who exists somewhere between the opposite poles of transsexual and transvestite. Transgenderists may have some brain wiring issues, but also may have some sexual kinks as well. A transgenderist may live entirely as the opposite sex, even to the point of having limited hormone therapy, but almost never have surgery to change their physical sex. Transgenderists seem to prefer being 'somewhere in the middle'. Part of the reason for the adoption of this term is to attempt to politically unite these various different types of people under one 'flag', for the purpose of mutual support and social power and defense.