Pansexuality is sometimes described as the capacity to love a person romantically irrespective of gender identity or biological sex. Some pansexuals assert that gender and sex are meaningless to them. The word pansexual is derived from the Greek prefix pan-, meaning "all". This includes potential attraction to people who do not fit into the gender binary of male/female implied by bisexual attraction. Many people who identify as pansexual may associate with people of all sexual orientations, but are not necessarily interested in people of all sexes or genders.

Basically, an orientation that sees other people as individuals, rather than a product of their gender or biological sex.
Or just, open to all.

See also: Omnisexual, pangender, polysexuality, genderqueer, polyamorous

http://tribes.tribe.net/pansexual