A person of any gender who has the potential to be attracted to both males and females. This does not mean that they are:1) trying to attract attention2) not-quite out of the closet as gay/lesbian 3) confused4) about to be unfaithful in any way.A bisexual person has the potential to be attracted to either gender. This doesn't mean that they will be incomplete without regular sex with both genders; it's more of a potential energy thing rather than kinetic . It's also an emotional/romantic thing, not just about sex.Although some members of the gay/lesbian community look down upon bisexuals, it's just as real and valid as any other sexual orientation.