This article is from the BiSexuality FAQ, by Jon Harley email@example.com with numerous contributions by others.
Many bisexuals feel they have a "preference" for one sex over the other, but
they do not deny their attraction for that other sex.
Some bisexuals, however, have no such preference, and instead focus their
attractions on qualities they see in an individual regardless of that person's
sex. Sometimes these qualities involve gender, sometimes not. For example,
some people find men attractive as men, and women attractive as women; others
find people's sex irrelevant.