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

Kaorin, Azumanga Daioh "And just to prove it, I wouldn't mind if [Sakaki] was a guy!"

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Alice has never really been in love with anyone else but Bob. She can only be attracted to/aroused by him  not even other men, or, for that matter, women. Not even porn can do it for Alice unless Bob is in the porn. If Bob turns into a girl, Alice will still be hot for her. If Bob is technically more than one person, Alice will love all of them, to the exclusion of everyone else that does not inhabit Bob's body. The only way you can describe Alice's sexuality is "Bob-sexual".

Sometimes a serious character type, sometimes a joke said by Charles to describe Alice's infatuation with Bob. Sometimes it gets to the point where Alice becomes a Stalker with a Crush or something similar.

Uninterest in attractive people of appropriate gender, other than one's love interest, is commonly shown as an indication of being deeply in love; whether this is Truth in Television varies between couples. Feeling this way about a partner is not as unusual for those on the grey portions of the asexual and/or aromantic spectrums, for example. Many shippers tend to believe their One True Pairing is affected by this.

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This trope is when someone's only attracted to one person at all. If the person is a sole exception to someone's normal sexual preferences, it's If It's You, It's Okay, being hetero- or homosexual plus one, rather than asexual plus one.

See One True Love. Not to be confused with Single Object Sexuality or Object Sexuality in general.

Examples:

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Anime & Manga

Comic Books

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Fan Works

Films  Animation

The Book of Life: "I Will Wait For You", basically describes how Manolo will wait for Maria. Maria towards Manolo. "And look closely: she has the Sanchez curl next to her eyes. She only has eyes for Manolo."  Jorge Gutierrez from The Art of the Book of Life. Like Manolo, Joaquin has only had eyes for Maria. Xibalba and La Muerte only have eyes for each other. "His flames burn green with envy. The only red in his design is in his skull-shaped irises because he only has eyes for La Muerte."



"Her dress is red because it represents love, passion, and life. The only blue in her design is in her eyes because she only has eyes for Xibalba."

How to Train Your Dragon and How to Train Your Dragon 2: Hiccup and Astrid towards each other. Unlike the former's parents, it's more of an implied version—they have known each other since childhood and it's established at the very beginning of the first film that Hiccup has liked her for a while, and while Astrid was initially not interested in anyone at all (and was equally aloof towards all of her classmates), Hiccup succeeds in winning her over by the end of the movie. By the time of the second movie (five years later), they've obviously been together for a long time, and are just as much in love as ever. This is furthered confirmed in the TV series, as neither one shows a romantic interest in anyone else (i.e., Hiccup was one of the two boys who didn't gain a crush on Heather). Hiccup's parents, Stoick and Valka. Even after Valka was abducted by dragons twenty years previously, Stoick still always loved her and never showed even the slightest interest in remarrying. Valka, for her part, lived away from all humans for those twenty years. When she and Stoick meet again, they pick up their relationship from where they left off, much to Hiccup's delight.

In the Hotel Transylvania films, the "zing" is a combination of Love at First Sight and this trope for monsters. A monster zinging with someone confirms to them that this person is their one and only. In the climax of the first film Dracula changes his mind about Mavis and Johnny being together the moment he learns that Mavis zinged with Johnny . In Hotel Transylvania 3: Summer Vacation this trope ends up being averted when Dracula unexpectedly zings with Erika. This is a shock to him since he had already zinged with his late wife Martha and it was commonly believed that a zing only happens once. The implication is that Dracula was finally at a point in his life when he was ready for a Second Love

. In Hotel Transylvania 3: Summer Vacation In Cinderella, by his father's account, the prince was not interested in relationships, even as numerous women gushed over him. Until he met Cinderella. In the third movie, this helps him identify that Anastasia is not the one he danced with even under the spell's effects, because when he touched her hand, he felt nothing.

Films  Live-Action

Literature

Live-Action TV

Music

Incredibly widely used in popular music through the years. For example: The Platters, "Only You" Only you and you alone

can thrill me like you do

and fill my heart with love for only you "I only have eyes for you", composed in 1934 by Harry Warren and lyricist Al Dubin, and performed by artists as diverse as Frank Sinatra, Al Jolson, Billie Holliday, Rod Stewart, and The Flamingos. My love must be a kind of blind love

I can't see anyone but you...

You are here, so am I

Maybe millions of people go by

But they all disappear from view

And I only have eyes for you "He Stopped Loving Her Today", written by Bobby Braddock and Curly Putman, and released in 1980 by George Jones: He said I'll love you 'til I die

She told him you'll forget in time...

Kept some letters by his bed

Dated 1962

He had underlined in red

Every single "I love you"

He stopped loving her today

They placed a wreath upon his door

And soon they'll carry him away

He stopped loving her today. "There Will Never Be Another You", written by Harry Warren and Mack Gordon And in our moment of parting,

This is all I want you to know...

There will be other lips that I may kiss,

But they won't thrill me,

Like yours used to do Even '90s indie pop got in on the game, as in "Anyone Else Isn't You" by The Field Mice, written by singer Bobby Wratten: Other than you, I want no one

If I can't have you, I want to be alone

Anyone else isn't you

And if they're not you, I don't want to know...

Arguably Toshi of X Japan, if the lyrics of "Crystal Piano no Kimi," his overwrought love poem for his lifelong (aside for 10 years) best friend and band co-founder Yoshiki are any indication.

Nina Simone's "My Baby Just Cares For Me"; Liz Turner is not his style,

And even Liberace's smile

Is something he can't see.

I wonder what's wrong with baby?

My baby just cares... for me.

The Steel Panther song, Community Property first appears to be this, with the line, "If suddenly you were a guy, I'd be suddenly gay." But then subverted with; "My heart belongs to you, but my cock is Community Property."

Myths & Religion

Classical Mythology: Hades towards Persephone. Leuce and Minthe are much later Roman additions. Before that, Hades was almost never shown having any sort of affair behind his wifes back or being in any sort of romantic or sexual relationship prior to their marriage. Considering the track record that many of the other Greek gods tend to have, this is practically a miracle. Minthe was one exception, and Persephone quite literally stomped that one out (creating the mint plant in the process).

shown having any sort of affair behind his wifes back or being in any sort of romantic or sexual relationship prior to their marriage. Considering the track record that many of the other Greek gods tend to have, this is practically a miracle. Minthe was one exception, and Persephone quite literally stomped that one out (creating the mint plant in the process). To a lesser extent, Artemis, who, being the virgin goddess of the hunt, had no interest in romance whatsoever, except for her crush on Orion. It didn't end well.

Podcasts

Caleb in The Bright Sessions admits that the only person who "does it for him" is Adam.

Pro Wrestling

Radio

Paula in Nebulous is completely Nebulous-sexual, save for some Early Installment Weirdness where she fancies the Loverlies (and the Worserons) just as much as everyone else.

Theatre

William Shakespeare's A Midsummer Night's Dream employs as a plot device a magical flower whose nectar causes people to become singularly enamored with the first person they see after having it applied to their eyes. Naturally, things start going a little off-course when Puck applies the juice to the wrong Athenian's eyes, and Hilarity Ensues.

The Phantom of the Opera: The Phantom for Christine. Oh so much. The Phantom: You alone can make my song take flight, and help me make the Music of the Night.

Les Misérables has Marius and Cosette be this for each other. This gets rather silly on the side of Marius because he totally misses Eponine's incredibly obvious crush on him. Eponine, for her part, seems quite Marius-sexual, and thus helps him hook up with Cosette so he will be happy.

In The Winter's Tale, King Leontes refuses to remarry after the death of Queen Hermione, even though his advisers try to pressure him to do so. Paulina does have some hand in it, urging him to promise to not remarry unless she approves of the bride, but Leontes seems perfectly fine with agreeing to those terms. The way he speaks about his dead wife upon seeing her statue, and the way Paulina talks after Hermione comes back to life suggests that before his jealousy, the two had been deeply in love.

Video Games

Visual Novels

Web Animation

Doki of There she is!! is 100% Nabi-sexual.

Church from Red vs. Blue is only interested in Tex, and will go out of his way to make sure she is alive and well even when she is being antagonistic. When she is briefly turned into a man in a flashback during Season 14, Church says he's cool with it (but still leaves because of the other weirdness around him). It helps that Tex is the memory of the dead wife of the man Church was based on, who was always obsessed on bringing her back to life.

Webcomics

Web Original

Web Videos

Awkward. has Alex, who is, as a result of years of harsh rejections, a depraved Lester-sexual as of the start of the series. Rather than being the result of actual attraction or compatibility, Alex's record of rejection leads him to crave it; Lester being both heterosexual and Alex's housemate, he is perfectly positioned to give Alex the rejection he comes to crave on a regular basis.

Nothing Much To Do: A modern-day vlog adaption of Much Ado About Nothing, has Benedick and Beatrice towards each other. They fell for each other when they were fourteen but miscommunication pushed them apart. Years later despite living at different ends of the country, there's no suggestion they've ever been attracted to anyone else (apart from celebrity crushes) and both of them are determined to stay single and claim to hate dating. They eventually admit their feelings and get together.

Out With Dad: Vanessa obviously feels some sort of an attraction to Rose, but at first she isn't shown displaying interest in any other females in the series. It's averted in episode 2 of Vanessa's Story when she does have sex with Kayla, though later from what Vanessa says it was just submitting to her.

The Call of Warr: Ashes wants Durkin, and only Durkin. Her biggest concern when he goes missing is that she doesn't know if he has a girlfriend, and while Glintz-Terry is trying to woo her, she just pushes him away and snaps at him.

Western Animation

Real Life