Being a person who is attracted sexually or romantically to both genders. People of the bisexual persuasion are not always looking for a lover of the samed gender. MAny Bisexual men are involved with woman, and as such with female bisexuals. A bisexual person does not ALWAYS have multi-gender orgies, thought it is not uncommon for such a situation to take place.
A person capable of having physical, romantic, and sexual attraction attractions towards both sexes. What bisexual is NOT: Sex fiends looking to hump everything in sight. Just a phase of confusion. A fad; though for some females it is considered "sexy" to be bisexual. A person who engages in orgies. (Though some do, I'm sure.)
To be bisexual is to be attracted to a person regardless or gender or sex. It does not mean that you cannot make up your mind, it does not mean you are sex-crazed, and it does not mean that you will by default participate in orgies every night.
Of course, there is probably someone reading this that DOES participate in orgies every night, but they would be in the minority.
The often overlooked B in LGBT. A person capable or romantic and sexual attraction towards a partner of either gender. A person twice as likely to be turned down for a date on Saturday night. Someone who has to prove to the heteros that he is not gay, and prove to the homos that he is not straight. A trait hetero men find extremely attractive in women and seem to find frightening in men.