Bipolarity

Most people think there are just two sexes - male and female. Such is not the case. People who are intersexed and people who are transsexual constitute sexes which are neither exactly male nor exactly female.

Likewise, gender is not a simple fact of "either/or". Gender is exhibited by countless signals, from articles of clothing to cosmetics to hairstyles to conversational styles to body language, and much more. Through our culture trends to group characteristics into "masculine" and "feminine", many people find some amount of gender transgression exciting, so there is some fluidity between the two categories. Ultimately, gender is a "mix and match" mode of self-expression, and people within our culture are ever finding new ways to express their gender, with exciting subtleties and intriguing implications.

In general, it works best to think of all effects - sexual orientation, gender identity, sexual identity, and may others - as elements within a spectrum of self-expression, rather than in just one of two or three ways.