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32.
Reading some of the above answers showed a rather entertaining mix of beliefs concerning bisexuality, mostly just attacks on it vaguely disguised as definitions. I don't care about the fact that you can write well, it doesn't persuade me that I'm 'mentally ill' at all. Bisexuals, like me, are simply people capable of falling in love with people of either gender. It's a simple matter of love, and NOT a step towards being gay. I acknowledge the fact that there are a lot of people out there who claim to be bisexual when they're really straght/gay/lesbian, but the majority of these are attention seekers. I am NOT to be classed in this category; if I was an attention seeker, everyone would know. I haven't told more than two people in the whole world so far, excluding all the people reading this. And, contrary to popular opinion, bisexual people can hold down relationships with one person at a time. They don't find the need to run off and have sex with the first good looking person they meet. That person is a bigot, not a bisexual. Just because some bigots are bisexual doesn't mean that all bisexuals are bigots.

In conclusion, I'd like to say that bisexuality is a perfectly normal choice that, whether they like to admit it or not, almost 95% of the population of the world is sitting on.
I've always wanted children, ever since I can remember. I've fallen desperately in love with a girl, so deep that it hurts every time I see her. But I fantasize over men and prefer their bodies. I am bisexual - get over it.
by Bisexual Boy April 09, 2008
 
57.
A person who is attracted to both genders. This is not the same as pansexuals as gender is irrelevant, typically bisexuals aren't attracted to gender fluid people whereas pansexuals are.
"Did you hear that Katie had a crush on Haley and Jack?"
"Yeah, but she is bisexual"
by randomqueer July 27, 2014
 
58.
Likening both male and female. This means you are not sexually attracted to transgender people but to both male and female.
Jack liked the d and the p. Jane was also bisexual so they had an awesome 3-way.
by Real bi girl April 06, 2014
 
59.
Somebody who is romantically and sexually attracted to men, women and any other gender identification. (Note : Pansexual means that you love somebody despite or not regarding/caring about their gender whilst bisexual just means loving all genders)

Prejudice faced by bisexuals :

People often think it's easier to be a bisexual girl then a bisexual man but this is simply not true. As a bisexual girl I face just as many prejudices as guys. It's thought by some that a bisexual girl has it easier as some men find bisexual females attractive, but honestly this doesn't make it any easier. This leads to the sexualization of bisexual females and the stereotype that we're all sex fiends or pretending to be bi to attract these type of men. This is not to say, that men don't face prejudice too. I'm just trying to make the point that both women and females face biphobic behaviour. Some people say that bisexuals are people who are really gay or straight, that are saying their bi to get attention or avoid coming out as gay.

Positive things about being bisexual :
Once you accept your sexuality it's a great feeling and allows you to stop pushing down feelings you may have once tried to supress. Also, both guys and girls are amazing so if you're attracted to both, there's no point limiting yourself to one gender.
Example of things a bisexual could say (I included some ones that show sexual attraction and some that show romantic attraction) :

eg. That male YouTuber is so hot. I'd totally bang him.
eg. She's really fit. Her red lipstick and long socks turn me on.
eg. I have a crush on a guy from my class I'd love to date him.
eg. I miss my ex-girlfriend but I have to move on and find someone knew.

Example of the type of conversation a bi person can get into since many people will assume you're straight or gay. They don't consider that you could like both. (I wish people irl were as accepting as B and C are in this when they finally realise A is bi) :

Everybody (all girls) : *talking about 'hot' males*
Person A (bi one) : Yeah, isn't Toby hot.
Person B : Totally.
Person A : Yeah and Sophie's also really attractive. I'd totally date her.
Person C : But, you're a girl...
Person A : Yeah and?
Person B : So you're a lesbian? But you just called a guy hot.
Person A : Toby is hot, though.
Person C : So you're straight?
Person A : No, I like both genders. I'm bisexual.
Person B : Oh, I get it.
Person C : That makes sense. I never thought of that. Cool.
by beingbisexual July 26, 2013
 
60.
Describing something that has the romantic and/or sexual attraction to both genders. Although it was once a word used almost solely to describe someone who ACTUALLY is bisexual, it has come to also mean attention-seeking, scene kid.

Please, unless you are actually bisexual, don't come out as one. Typically, people who aren't and do, will say that they are straight again soon after. This has already lead to the much of the LGBT community to hate on bisexuals and others outside of it to think being LGBT is a choice.

Being LGBT isn't a choice, so stop acting like it.
1990's:

Person 1: Zach is dating Samantha.
Person 2: Wait, I though he dated Stan. Isn't he gay?
Person 1: Nope he's bisexual.

2012:
Scene kid 1: yah im totaly bisexual now c:
Scene kid 2: o rly? so u wanna go out sometime?
Scene kid 1: nope i only date boys. dating girls is gross XD
Actual bisexual: Shut the fuck up.
by VoodooPenguinPH February 18, 2013
 
61.
a person who can reach down another's pants, and be happy with whatever they find
Im bisexual,I love chris, and I love christina.
by BisexualBoi November 27, 2008
 
62.
Someone who is fucking awesome.
Tila Tequila goes down on girls and guys. She's bisexual.
by Bobby.M July 10, 2008
 
63.
Bisexuality is being attracted to both men and women but as many people don't know: Bisexual means that you prefer one over the other/lean towards either men or women. If you don't lean or have no sexual preference at all that is pansexual . Bisexuality is NOT being promiscuous, a 'whore' or being 'confused'.
"I am bisexual I like Girls but lean towards guys"
by Justme13 October 17, 2011