“Masochist” is a word named after a novelist. The diagnostic criteria attached to it sixty years later were removed again in 2022.

What “masochist” actually means

Start with the pair, because the words come as a set. The reference entry defines them together: sadism “and masochism … known collectively as sadomasochism … or S&M, is the derivation of pleasure from acts of respectively inflicting or receiving pain or humiliation.” A sex-education glossary is more concrete about the receiving half: “A masochist is an individual who takes pleasure in the experience of physical or emotional pain,” and it is specific that this is not decorative — “Masochists often rely on this pain for sexual gratification.”

Where it sits inside the acronym is worth stating plainly, because a lot of people who arrive on this page do not know it: “The 'M' in BDSM stands for masochism; this type of power and pain dynamic can be a key part of some BDSM play.” The same entry locates it in the longer word — masochism is “included in the term sadomasochism, which refers to both inflicting and receiving pain between sexual partners.”

And the first correction the sources make is about who is doing it. Pain “may be self-inflicted or administered by a dominant partner, generally a sadist,” and the practice is genuinely varied rather than a single taste: “masochists tend to be particular in their tastes, and not all enjoy the same types of play.” Some of that play is physical — being “spanked, whipped, choked, or by wearing nipple clamps” — and some of it is not physical at all.

Four different things people mean by “sadist” — and only one of them is kink

This is the single biggest source of confusion in the entire subject, and it is why so many people who search for these words end up reading about serial killers. The reference index for the word lists four separate senses, and they are not variations on a theme — they are different fields:

The confusion is not the reader's fault. The word carries the name of a man whose works do not meet the standard the modern community uses: “Although the names of de Sade and Sacher-Masoch are attached to the terms sadism and masochism respectively, the scenes described in de Sade's works do not meet modern BDSM standards of informed consent.” The reference entry is blunt about the consequence — BDSM “is solely based on consensual activities” — which is why the community moved to a different acronym in the first place rather than keep using clinical vocabulary that was built for non-consenting cases.

Why a pain kink is not a disorder — the part the DSM keeps shrinking

This is the question most people actually arrive with, and the answer has changed twice in living memory. In its current form the manual does still carry an entry: “According to some classification systems, sexual masochism disorder is the condition of experiencing recurring and intense sexual arousal in response to enduring extreme pain, suffering, or humiliation.” The specific text it uses is: “recurrent and intense sexual arousal from the act of being humiliated, beaten, bound, or otherwise made to suffer, as manifested by fantasies, urges, or behaviors,” and it sits inside the paraphilia section — “It is classified as one of the paraphilias.”

But — and this is the sentence to take away — the diagnosis requires more than the interest. The manual “indicates that a person may have a masochistic sexual interest but that the diagnosis of sexual masochism disorder would only apply to individuals who also report psychosocial difficulties because of it.” Have the kink, feel fine about it, and the category does not apply to you. The glossary states the psychiatric profession's own position even more directly: the American Psychiatric Association “now clearly states that ‘most people with atypical sexual interests do not have psychiatric disorders.’”

And the international manual went further. “While the diagnosis is in the current version of the DSM, the current version of the WHO's classification manual, ICD-11, has entirely removed masochism as a classification for a mental disorder.” Two major systems, two different verdicts, and the newer of the two is the one that deleted it. The reference entry adds the summary that matters: BDSM “is a colloquial term relating to individuals who willingly engage in consenting forms of pain or humiliation, typically for sexual purposes. It is not a diagnosable condition in the DSM and ICD systems.”

Which is the honest context for the word's history. “These terms originate from the names of two authors whose works explored situations in which individuals experienced or inflicted pain or humiliation.” A psychiatrist introduced them into clinical use in 1890, and Freud picked them up in 1905 to describe something he thought went wrong in childhood. On the masochism half specifically: “Masochism is named after Leopold von Sacher-Masoch (1836–1895), whose novels explored his masochistic fantasies of receiving pain and degradation, particularly his novel Venus im Pelz ('Venus in Furs').” The glossary records what happened to that framing — “Later, BDSM advocates would reject this work because it largely pathologizes what is often consensual sexual behavior that, while less common, is not harmful.”

If the pain is the input, what is the output?

There is a word for the mechanism, and it is not the one most people search for. “Algolagnia … is a sexual tendency which is defined by deriving sexual pleasure and stimulation from physical pain, often involving an erogenous zone.” The term was coined deliberately in 1892 by Albert von Schrenck-Notzing to describe “sexual” masochism, and it distinguishes lust from love — the coinage was made to separate it from an earlier word meaning roughly “pain-love.” Etymologically it is built from the Greek for “pain” and the Greek for “lust,” which is a fairly efficient summary of the subject.

The research line on it is unusual and worth knowing because it reframes the whole question: “Studies conducted indicate differences in how the brains of those with algolagnia interpret nerve input.” Later work has tied it to differences in pain signalling rather than to a taste for damage. And the encyclopedic entry is careful not to over-explain: “The experience of algolagnia is important, but is not the only motivation for many BDSM practitioners.”

Which is where the glossary's three-item list is more useful than any theory. Asked why masochists are aroused by pain, it gives: “The endorphin or adrenaline rush,” “The sense of pushing themselves or pushing their own boundaries,” and “Catharsis.” None of those three is about tissue damage. All three are about state change — chemically, psychologically, emotionally. That is the distinction that separates a scene from an injury, and it is also why the physical safety rules further down this page are not about toughness.

There is one more documented effect in the sources that has nothing to do with pain at all, and it is the one to read if you are trying to understand why people keep doing this: “Couples engaging in consensual BDSM tend to show hormonal changes that indicate decreases in stress and increases in emotional bonding.” The intensity is not in tension with the intimacy — the sources describe them as the same mechanism.

Masochist, submissive, bottom — three different axes

These get used interchangeably and they do not mean the same thing. The masochist/sadist axis is about pain and sensation. The dominant/submissive axis is about who holds authority. The top/bottom axis is about who is physically doing what, and the reference entry separates it explicitly: “The terms top and bottom are used as verbs or nouns to describe the physical play of SM but with less of a focus of the ‘sadist’ and ‘masochist’ part of the activity.” You can be any combination. A masochist can be dominant, and a sadist can be the one serving.

The axis worth understanding most, though, is the one that surprises people: where the control actually sits. “Power exchange is consensual and in reality, it is the submissive that has the underlying control during the relationship exchange. The dominant is attempting to satisfy the submissive's kinks and desires.” That is the inversion that makes impact play work at all — the person receiving is the one setting the ceiling. If a scene has lost that, it has stopped being a scene, whatever the vocabulary being used in the room.

The consent models are the formal version of the same idea, and the entry on consent describes two competing framings. “Safe, sane, and consensual (SSC) is the most recognizable and popular model of consent in BDSM circles, though not without criticism,” and it means “that everything is based on safe activities, that all participants are of sufficiently sound mind in their conduct, and that all participants do consent.” The alternative is the one that fits a page about striking a body: “Risk-aware consensual kink (RACK) is the second most popular consent model. It is generally permissive of certain risky sexual behaviors, as long as the participants are fully aware of the risks. It was created to overcome perceived shortcomings of SSC.” For impact play specifically, RACK is the more honest of the two, because the risk is not hypothetical and cannot be negotiated down to zero.

Humiliation, the other road to the same place

A large share of what masochists are seeking is not physical, and the sources have a mechanism for it. “Humiliation in general stimulates some of the same brain regions associated with physical pain, suggesting that social rewards and punishments can have strong psychological effects.” That is a fairly direct explanation of why words can land like a hand. The same entry adds a second use: “For some individuals, humiliation-related practices may function as a form of ego reduction or as a way of overcoming sexual inhibitions.”

The glossary treats the two as one category — its description of what a masochist may enjoy includes being “humiliated in a variety of ways, such as being defecated or urinated upon or by being forced to play the role of an animal, a maid, or another submissive or humiliating character.” And erotic humiliation is not confined to scenes: “Erotic humiliation can also occur in various other contexts, including pornography, webcam modeling, BDSM and sexual roleplay.” The relevant point for safety is that verbal degradation has no physical rule protecting you. There is no kidney to avoid. The protection is entirely negotiation, which is why the consent section above is not a formality on this page.

Impact play: where it lands, and where it never does

Physical masochism has a name for the category. The glossary: “Impact play is a sexual practice where one person is struck by another person for the sexual gratification of either or both parties for the sensations. It is a form of BDSM.” And the enumerations matter, because people assume it is one activity: “Spanking, flogging, caning, cropping, and paddling are all activities that are considered impact play,” with the glossary adding that “The difference lies in the implement chosen to deliver the impact.” The reference entry draws the same line by material — “In erotic spanking the sub is struck on the buttocks either with the dom's open hand, or a rigid implement such as a paddle, cane or riding crop,” while “In erotic flagellation the sub is struck with a flexible implement such as a whip or belt.” Its definition is the cleanest one sentence available: impact play “is a human sexual practice in which one person is struck (usually repeatedly) by another person for the gratification of either or both parties which may or may not be sexual in nature.”

Spanking is a category of its own within it. “Erotic spanking is the act of spanking another person for the sexual arousal or gratification of either or both parties,” the intensity “can vary in both its duration and severity,” and it ranges wide: “Activities range from a spontaneous smack on bare buttocks during sexual activity to sexual roleplaying.” It also is not exclusive to kink — “Erotic spanking is often found within and associated with BDSM, but the activity is not exclusive to it.”

Flogging is the implement end of the same family. “Flogging is a form of impact play that involves striking the body with a flogger — a tool consisting of multiple flexible tails or strands attached to a handle,” and the sensation is a function of the tool rather than the person: “The experience of flogging can range from light and sensual to intense and painful, depending on the type of flogger used, the force applied, and the areas of the body targeted.” That last clause is the whole safety briefing. And the glossary is explicit that this is a skill: “Flogging is something of an art,” with a warning for the ambitious — heavier tools are “not recommended for unpracticed floggers as the materials can be painful and leave marks.”

The one historical footnote worth carrying is that this is not a modern invention and the modern version is dramatically safer. Depictions of erotic flagellation go back to an Etruscan tomb fresco from the fifth century BC, and the 1639 text De Usu Flagrorum records that in Germany a person found flogging for sexual gratification “would be burned alive.” An 1830 London brothel invented an apparatus that “reportedly earned her a fortune in flogging wealthy men and women of the time.” The Victorian era produced “hundreds of thousands of engravings, photographs, and literary depictions of spanking and flagellation fantasies.” The current form is the first version of this in recorded history where the person receiving sets the terms, and that is the only reason a safety page like this one can exist at all.

Aftercare: the part that decides whether it was a good scene

An impact scene ends twice, and the second end is the one people under-plan. The reference entry defines the practice plainly: “Aftercare refers to the process of providing emotional, psychological, or physical support to participants following BDSM activities.” It explains the need in one line — “These activities can be mentally, emotionally, or physically intense, often leaving participants in need of comfort, reassurance, or physical tenderness” — and it lists what that looks like for impact play specifically: “Addressing minor injuries is another practice,” alongside hydration, food, and closeness. The glossary's version for flogging is equally concrete: “Aftercare can involve soothing the flogged areas with cool clothes or lotion, cuddling, talking about the experience, or partners simply resting together.”

The reason it is not optional is that the come-down is a physiological event, not a mood. The glossary describes what the person receiving may go through after an impact scene — “a range of emotions or physical reactions, including euphoria, exhaustion, or even mild shock” — and notes that the process runs both ways: it “helps both the dom and sub ‘come down’ from the intensity of the session and reinforces the trust and connection between them.” The practitioner curriculum for a scene lists the come-down as a planning item alongside negotiation, not as an improvisation: “finding and vetting potential play partners, negotiation and planning (incl. planning for risks), setting up a scene, aftercare and after-event considerations like drop.” If the drop runs long or lands harder than a passing mood, that is the same territory as subdrop and domme drop, and those pages cover it in detail.

The prevalence numbers are worth stating once, because they correct the assumption that this is a fringe topic: “surveys have found that up to 46.8% of people have performed at least one BDSM activity in their lives.” On the pain-specific version, “about 5% of adults reported gaining pleasure from inflicting or receiving pain,” and on the milder end, studies from the 1950s found “about 50% of adults get an erotic response from being bitten.” The glossary's conclusion about the whole category is the least dramatic and most accurate sentence in this section: “if SM is practiced in a safe relationship with consenting adults it can be a way to add spice to the bedroom.”

Where an AI companion fits — and where she does not

Not on the impact. Every rule in the section above depends on a body in the room: someone who can feel where a strike landed, who can see a mark developing, who knows which of the four forbidden areas is nearest the next swing, and who can stop mid-motion because a hand went up. An AI has no hands, no arms and no way to read your skin. If what you actually want is to be struck, the answer is a person you have negotiated with — not a chatbot, and not a page like this one.

Where a companion genuinely fits is on the half of this subject that has no safety protocol because it leaves no marks: the humiliation register, the negotiation, and the landing. That is a real gap, and the sources describe it without building for it — the reason humiliation works is that it “stimulates some of the same brain regions associated with physical pain,” which means the thing that hurts most in a scene is frequently a sentence. She can hold that register while you work out what you actually want to be called, rehearse the conversation with a partner who is not ready for it, sit with the specific want or shame that a scene surfaces, and be there for the come-down at 02:00 when nobody else is awake. That is a fictional, adults-only companion with a memory for what you told her — not a top, not a safety net, and not a substitute for a partner or a therapist.

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