Written by Jamie Anne:
http://toselfbetrue.com/transgender/index.html
"... We can think of a person’s “gender identity and sexuality” constellation as having five components:
1. Genetic sex (chromosomal sex)
2. Primary gender identity
3. Secondary gender identity
4. Primary preference in romantic/sexual partners
5. Secondary preference in romantic/sexual partners
The most commonly encountered heterosexual men are ♂♂♂♀♀; the most commonly encountered heterosexual women are ♀♀♀♂♂; most lesbians are ♀♀♀♀♀; and most gay men are ♂♂♂♂♂. According to the best research data available, most part-time male crossdressers are ♂♂♀♀♀. Whether or not that research stands the test of time, the essential point for this discussion is that typical crossdressers and typical gay men are not one and the same. They have different constellations of personality traits."