What BDSM stands for, and what it covers

The letters are younger than the things they name. Sadism and masochism were coined in 1886 as diagnoses, bondage and discipline are older English words, and the compound BDSM is first recorded in a 1991 Usenet post, where it gathered three overlapping communities under one string. The word entered the mainstream two decades later on the cover of a novel, and it arrived carrying an image of leather, dungeons and equipment that the surveys do not support.

What the surveys find is a majority interest in its mildest forms and a small minority in its heaviest. The catalog reads the same way. Its BDSM collection holds 87 entries, the largest grouping on the site, and the entry at the top of the whole index of 486 is dominance and submission, at an estimated 45 percent of adults. The entry at the foot of the collection is a community umbrella term with an index of 9. The distance between those two is what the word covers.

The pairs inside the acronym

Each pair names a different thing, and a person can hold any one of them without the other two. The first is a physical act, the second a relationship of authority, the third a response to sensation.

Bondage and discipline are the B and the D. Bondage, third on the whole index at an estimated 16 percent, is restraint agreed in advance: rope, cuffs, tape, the forms from shibari to suspension. Discipline is rules and consequences, a dominant who sets expectations and a submissive who agreed to keep them, and it is about behaviour and structure even when it borrows the implements of sensation play. The two are paired by history, from the older phrase "B&D", and by nothing else: a person can be tied without any rule in force, and kept to rules without any rope.

Dominance and submission are the D and the s, the pair the community writes as D/s. Dominance and submission is the exchange of authority itself, and the catalog files submission and dominance separately because the two halves are searched for and lived differently: submission ranks second on the index and dominance fourth, at an estimated 25 percent. Switching, at 12 percent, is the person who takes both roles. The dynamic scales from an evening to a household, through femdom, master and slave and total power exchange.

Sadism and masochism are the S and the M, and they are the oldest words and the only clinical ones. Richard von Krafft-Ebing coined both in Psychopathia Sexualis in 1886, after the Marquis de Sade and Leopold von Sacher-Masoch, to name arousal from giving and from receiving pain. In the catalog masochism sits at an estimated 23 percent and sadism at 5 percent, and the practices between them, spanking, impact play, flogging, wax play, are filed under the umbrella the clinical literature calls algolagnia and the catalog calls pain play.

What the surveys count

The population studies agree on the shape: a majority with some interest, a large minority with some experience, and a small minority for whom it is an identity.

Holvoet and colleagues, in the 2017 Belgian study titled Fifty Shades of Belgian Gray, surveyed 1,027 adults from the general population. 46.8 percent had performed at least one BDSM-related activity, a further 22 percent had fantasised about one without acting, and 12.5 percent engaged regularly. The authors concluded that interest in BDSM is present in most of the general population.

Lehmiller's 2018 survey of 4,175 American adults, reported in Tell Me What You Want, asked about fantasy and found the inverse of the old picture: only 4 to 7 percent had never had a fantasy involving BDSM. Joyal, Cossette and Lapierre's 2015 study of 1,516 Quebec adults found fantasies of dominance and submission widespread in both sexes, at least one adult in five reporting tying up or being tied up, and around 30 percent reporting spanking, with no significant gender difference.

The catalog's index lands where those findings do. Of the eight BDSM entries in the ultra-common tier, an estimated 20 percent of adults or more, every one is a dynamic or a mild sensation.

Entry	Rank of 486	Estimated prevalence
Dominance and submission	1	45%
Submission	2	45%
Bondage	3	16%
Dominance	4	25%
Spanking	9	22%

Consensual non-consent, a scene in which resistance is part of the script and agreed beforehand, is estimated at 30 percent, more widely reported than most of the physical practices. The equipment-heavy interests that the word conjures from outside are the rare ones: needle play at 1 percent, suspension bondage at 1.2 percent, fear play at 1.5 percent.

What a scene has that sex does not

A BDSM scene is defined by its frame as much as by its content. What will happen is agreed before it starts, a word or a gesture stops it at any moment, and the time after it is part of it.

The frame has its own vocabulary, and three of the collection's entries are not practices at all. Aftercare, the deliberate physical and emotional attention partners give one another after a scene, is estimated at 14 percent of adults, higher than most of the practices it follows. Muise, Giang and Impett's 2014 study of post-sex affection found it predicted sexual and relationship satisfaction in ordinary couples, which is the same mechanism under a community name. Subspace is the altered, floating state some submissive partners enter during intense play; Ambler and colleagues measured role-specific altered states of consciousness in a 2017 study. Subdrop is the low that can follow hours or days later, described by Sprott and Randall in 2016 for tops as well as bottoms, and Sagarin and colleagues measured the hormonal changes across a scene in 2009.

The safeword is the frame's best-known part. It is a word, or a gesture when speech is not possible, agreed in advance to mean stop without argument, and the community's traffic-light system, green for go on, yellow for ease off, red for stop, is the version most people learn first. The catalog carries no separate entry for it because ninety of its entries mention it in the scenes they describe; it is the condition of the collection, not a member of it. Negotiation is the same: the conversation before a scene about what is wanted, what is off the table and what the stop signal is, which the practices assume and the dominance entry describes as the dominant's first job.

Where the risk is

The community has a word for the practices whose risk cannot be negotiated away, and the catalog keeps the word. Edgeplay covers breath play, knife play, fire, blood and consensual non-consent; Newmahr's 2011 ethnography Playing on the Edge is the standard study of why practitioners seek it. The label moves between communities and over time, because it names a position on a risk spectrum and not an act.

The catalog files these with the rest and flags the risk on each page, in an advisory that sits apart from the content notice used for illegal interests. Breath play is estimated at 2 percent of adults, and its entry says what the forensic literature says: no method of restricting breathing is safe, partnered strangulation is the mechanism behind most fatalities, and the solitary form dominates the record because a person who loses consciousness alone cannot reverse it. A list of BDSM that left edgeplay out would describe a BDSM nobody practises, and a list that did not flag it would describe one nobody should.

When the manuals are involved

The two clinical words in the acronym are the two the diagnostic manuals still use, and both manuals draw the same line the community does.

The DSM-5-TR of 2022 lists sexual sadism disorder and sexual masochism disorder. Each has the interest in criterion A and the disorder in criterion B: for sadism, having acted on the urges with a non-consenting person, or urges that cause clinically significant distress or impairment; for masochism, distress or impairment alone. A person who practises either with consenting partners and is untroubled by it meets A and not B, and the manual states that A alone is not a diagnosis. The ICD-11, adopted in 2019 and in force since 2022, removed sadomasochism as a diagnosis altogether and kept only coercive sexual sadism disorder, defined by a non-consenting person. The reasoning is set out in the post on when a kink is a disorder; the short version is that a public-health classification has no use for a diagnosis whose only purpose is to count a private consensual preference.

Bondage, discipline, dominance and submission appear in neither manual under any name.

Where the law is

Consent is the line the community draws, and in some jurisdictions the law does not accept it as a defence.

The English case is R v Brown, decided by the House of Lords in 1993 after a police investigation known as Operation Spanner. A group of men who had engaged in consensual sadomasochistic activity were convicted of assault occasioning actual bodily harm, and the Lords held that consent was no defence to injury of that degree absent a recognised good reason. Three years later, in R v Wilson, the Court of Appeal quashed the conviction of a man who had branded his initials on his wife's buttocks at her request, treating it as akin to tattooing. The two decisions sit side by side in English law and are read against each other in every discussion since. Other jurisdictions draw the line elsewhere, and the catalog's entries on the heavier practices, from caning to branding, say where the legal uncertainty lies for each.

How the catalog files it

The 87 entries come from five of the catalog's eleven families, because BDSM is a grammar and not a subject. Forty-four are filed under Sensation and Pain, 34 under Power, Roles and Scenarios, six under Acts and Activities, two under Clinical Paraphilias, the sadism and masochism entries themselves, and one under Identity and Transformation.

The collection is easiest to read as four shelves. The dynamic is the first: dominance and submission and its forms at every duration. Restraint is the second: bondage and its forms, from shibari and the rigger to hogtie, mummification and self-bondage. Sensation is the third and the largest: spanking, impact play, flogging, caning, wax, temperature, electro and needle play, under the umbrella of pain play. The fourth is the psychological register, which has no implement: humiliation, degradation, praise, fear play, objectification and consensual non-consent.

Eight entries are ultra-common, 34 common, 24 uncommon and nine rare. The heaviest end of the collection is where the interest is thinnest, and grossdom, at the foot with an index of 9, is a community umbrella term with almost no documentation outside the forums that coined it. Two neighbouring collections take what BDSM does not: chastity and orgasm control, where the object of control is release, and pet play, where the role is an animal.