http://tvtropes.org/pmwiki/pmwiki.php/Main/DepravedBisexual

Linda, Gimme, Gimme, Gimme "There's no such thing as bisexual; it's just greediness."

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In most series, either Everyone Is Bi or there are No Bisexuals; there's usually not much room in between. However, there is one group of bisexuals who seem all too well represented in the mainstream: the cold-blooded murderous sociopaths.

This is a very different phenomenon from the Psycho Lesbian trope. Whereas the Psycho Lesbian is usually violent or deranged out of unrequited love and/or jealousy, the typical Depraved Bisexual is bi because, well, why not? Their willingness to sleep with everyone they can is just one facet of their Ax-Craziness — i.e. they don't consider certain relationships taboo, because they don't consider anything taboo. A slightly less pathological version of the trope depicts the Depraved Bisexual as "simply" supremely manipulative; recognizing the effectiveness of sex as a control mechanism, they resort to it at every opportunity — reasoning that successful seductions gain new thralls, while even unsuccessful ones tend to increase others' fear of you. Male instances are disproportionately likely to be Sissy Villains, but not as often as you might think.

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Interestingly enough, though, many if not most Lesbian Vampires are in fact bisexual. Fanservice, you know.

More common in film than on TV, where LGBT+ folk of any sort, and especially bisexuals, were originally a rarity (this changed over time). Of the TV instances, several are Mirror Universe duplicates, to show just how evil and different they are from the originals. At one time this was practically the only way an explicitly bisexual character could appear in any film, anywhere; in his book Bisexual Characters in Film, Wayne Bryant is able to fill a whole chapter of examples of this, as well as another book about bisexual murder victims. In more pleasant examples, bisexual characters simply don't follow Cast Speciation as much as a solidly gay character does and are less likely to be used. An exception is in a mystery plot, where a potential ex-lover being a suspect suddenly becomes much harder to pin down.

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Contrast Villainous Aromantic Asexual, where their lack of sexual interest is what underscores their villainous nature; and Anything That Moves, where the bisexual/pansexual character just happens to be also hypersexual , or Extreme Omnisexual, where the character is willing to bang anything. See also the older, far more discredited trope of the Depraved Homosexual, which this trope has largely replaced in modern works.

Examples:

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Anime & Manga

Arts

Prinna Domma from Aza Smith's Grindhouse and Watercolors. She once held an abusive relationship with Ebony and eventually left her for Psychopomp.

Comic Books

Fan Works

Films — Animated

Scar of The Lion King (1994) is seen by many fans as coded Ambiguously Gay thanks to his rather effeminate mannerisms and lack of a mate. However, a deleted scene shows him choosing Nala to be his queen and get rather excited at the thought of making "little Scars" with her.

Sausage Party: Douche is extremely eager to be used, analogous to sex, by human female Camille, and forces himself into Darren to control his body, saying "A hole's a hole!" Downplayed, however, in that there are a handful of other characters whose more fluid sexuality is depicted as normal, as seen in the infamous food orgy at the end.

Films — Live-Action

Jokes

The dad in this Parental Incest joke: a girl asks her dad if she can get a tattoo for Christmas. He agrees, so long as she gives him a blowjob. She reluctantly complies, but then says "Dad, your dick tastes like shit!" The dad replies "Oh, yeah, your brother wanted a computer."

Two friends meet, and one of them acts unusually shy. The second one asks: "What's the matter?" "Me and my girlfriend were on a date, and the maniac attacked us..." "Was it a sexual offender?" "Bisexual offender, to be precise."

Literature

Live-Action TV

Music

The 1990s Swedish camp/kitsch Eurodance group Army of Lovers was basically all about this trope.

The protagonist of Nick Cave and the Bad Seeds' rendition of "Stagger Lee".

Lady Gaga's persona in the Telephone series.

Discussed in Hayley Kiyoko's song "Gravel to Tempo". It's one of the many insecurities prompted by the narrator's Internalized Categorism-she feels predatory and like a betrayer for crushing on straight girls. I don't feel adequate, thinking I'm a monster in disguise....

Eminem: "Stan". From the album (The Marshall Mathers LP), Eminem gives us the song "Stan" about a yandere stalker's descent into madness when he thinks Slim (the star he's yandere for) is rejecting him by not sending him letters. He states in the letter that he thinks he and Slim should be together. He ends up killing himself and his girlfriend who's pregnant with their child. Turns out Slim gets them after Stan kills himself and his girlfriend.

Genesis: The narrator of "Jesus, He Knows Me."

AC/DC: "Dirty Deeds Done Dirt Cheap" is about a hitman who's implied to sleep with his clients, both men and women. For a fee, I'm happy to be, your backdoor man! note "Backdoor man" was a common euphemism for someone who has sex with a married person, in this case, a man who wants his nagging wife dead.

Myths & Religion

Older Than Feudalism: The ancient Greek myth of Zephyrus, who was married to his sister, but was madly in love with the young Spartan Hyacinth. However, Apollo also loved Hyacinth, and when he chose Apollo over Zephyrus, Zephyrus went crazy and cracked Hyacinth's skull open with a flying discus. Almost every male god in Greek Mythology shows some signs of depravity, and most of them were bisexual. The goat-god Pan might be the single best example. He's described as being so violent that the Greeks were afraid of waking him up in Arcadia. And nearly every story with Pan involves him trying to have sex with a nymph or a young shepherd boy.

Loki from Norse Mythology is, among other things, Fenris's father and Sleipnir's mother, thanks to the power of shapeshifting, allowing him to seduce a jotun's horse., and a conversation between Loki and Odin implies that Loki turned into a woman and got pregnant on more than one occasion. Loki is depraved in some ways, among them being responsible for Baldur's murder.

Huehuecoyotl from Aztec Mythology has male and female lovers, is a Shapeshifter, and often changes gender and species. While friendly toward humans, he's also petty and amoral at times and has been known to case war among mortals for no other reason than boredom.

Many Trickster deities are sexually flexible both in preference and equipment. Case in point: Baron Samedi .

. Lilith had sex with both Adam and Eve, according to one passage in Jewish literature that describes her as "the Woman of Harlotry."

In The Bible proper, from the Book of Judges, some men of Gibeah ganged up on an old man's house, desiring to "know" the Levite man whom he had taken in as a guest. Instead, the Levite gave them his concubine, whom they had abused and raped all night, which resulted in her death.

Pro Wrestling

Orlando Jordan had this gimmick in TNA. When his valet, Brittany, became a wrestler following his departure, she also proved to be an example, although it wasn't as central to her gimmick. Jordan molested nearly everyone within reach and all but publicly masturbated when the objects of his desire were too far away. Brittany was driven evil by rejection and happened to be rejected by both sexes.

Japanese comedy wrestlers like Otoko Sakari, Danshiko Dino, and Michael Nakazawa have this gimmick, augmented by their custom to wrestle in thongs.

Radio

Defied in Old Harry's Game. Thomas Crimp is perfectly willing to shag cartoon characters and mannequins, but he draws the line at having sex with other men.

Tabletop Games

Theater

Lord Voldemort in A Very Potter Musical seems to have a pretty enthusiastic sex life with Bellatrix, but is heavily, heavily implied to like Quirrell as more than just a friend.

Video Games

Visual Novels

Web Animation

Web Comics

Web Original

Western Animation