Kinky Cuffs

Handcuffs work well in keeping someone from strangling or punching you, as a form of restraint. In a sense, it counts as a form of submission, since the wearer isn't really in a position to escape, particularly if they're cuffed from behind or to a bedroom stall.

Therefore, it makes for a great fashion choice! A Custom Uniform of Sexy with handcuffs isn't always indicative that the wearer is submissive; they could be a Dominatrix and still wear handcuffs as a means to further stimulate their image. If taken to its logical extreme, the cuffs themselves are used for sex.

In some of the more ridiculous cases, Kinky Cuffs can be used as an Improbable Weapon.

Examples of Kinky Cuffs include:

Anime and Manga

Ikkitousens' Ryomou Shimei keeps a pair of cuffs on her, which she uses for trapping opponents in kinky submission holds... for her at least.
Agito the Unison Device from Magical Girl Lyrical Nanoha Striker S wears large (unconnected) handcuffs as part of her skimpy combat outfit. Goes rather well with her new master, namely, Signum, a dominant woman with a Whip Sword.
In another logical extreme variant, a Hentai called Nee Chanto Shiyou You had the resident Onee-Sama used these on the main character, twice, and in both times as a form of rape. He tried the same to her in between her first and second 'attacks', but it seemed to give her even more incentive to try it out on him again.

Fan Fiction

In the fanfic This Means War, Harry makes all the Weasley brothers dance YMCA in front of the school, their parents, and the girlfriends. Bill wears the policeman's uniform with the handcuffs. Fleur responds most positively.

Film

Subverted in-universe in the remake of Cape Fear starring Robert De Niro. De Niro's character, Max Cady, seduces a woman at a bar and takes her to his house to have sex with him. Given that we know that he was in prison for raping a 16 year old girl and that the story he tells the woman about having been in prison for defending a woman at a political protest, we know that he's up to no good when he pulls out a pair of handcuffs and puts them on her. However, she thinks that this is a straight example of this trope until he then beats her up and rapes her.

Live-Action TV

Deborah Morgan used the logical extreme variant; these were used on one of her boyfriends, to keep him from doing anything harmful to her.

Troper Works

Soundscape has a Mr. Fanservice and a Dominatrix wearing Kinky Cuffs. The latter is the Trope Namer.

Real Life

Very popular in The Eighties: belts with handcuffs as the buckle were pretty easy to buy in any mall.