A consensual crime is a public order crime that involves more than one participant, all of whom give their consent as willing participants in an activity that is unlawful. Legislative bodies and interest groups sometimes rationalize the criminalization of consensual activity because they feel it offends cultural norms, or because one of the parties to the activity is considered a "victim" despite their informed consent.
Consensual crimes are sometimes described as crimes in which the victim is the state, the judicial system, or society at large and so affect the general (sometimes ideological or cultural) interests of the system, such as common sexual morality. Victimless crime while similar, typically involves acts that do not involve multiple persons. Drug use is typically considered a victimless crime where as the sale of drugs between two or more persons would be a consensual crime. The fact that no persons come forward to claim injury has essentially made the two terms interchangeable in common use.
 Giving consent
When discussing consensual crime, one issue is whether all the participants are capable of giving genuine consent. This may not be the case if one or more of the participants are:
The generally accepted definition of a consensual crime is a criminal act committed by two or more people, who consent to involvement, and does not involve any nonconsenting individuals. The following is a list of criminal acts in various societies at various times and in different societies, where the issue of liability hinges on consent or the lack of it:
- Unlicensed prize fights and other criminal activities of a sporting nature where the players consent and the audience actively approves of what they see (in English law, see R v Coney).
- Murder or incitement to murder where one person actively solicits others to terminate their life, or the life of another. For example, a driver may be trapped in a burning tanker full of gasoline and beg a passing armed police officer to shoot him rather than let him burn to death. These situations are distinguishable from soliciting the cessation of life-sustaining treatment so that the injured person may die a natural death, or leaving instructions not to resuscitate in the event of death. Note that, in English law under the Suicide Act 1961, suicide is not a crime committed by a person who fails to die. Thus, those who assist in a failed suicide would be participants in a victimless crime because the would-be suicide cannot be tried. If the suicide succeeds, the legal issue is whether the assistants actively facilitated the death, or as doctors, nurses or carers, omitted to prevent natural death in circumstances where society believes they have no legal duty to take that preventive action. Some countries have characterised some of the possible situations as assisted suicide, while others make no judgment by imposing a separate label on conduct within the field of homicide. The issues may more generally relate to euthanasia where society debates whether, and in what circumstances, to terminate the lives of its citizens. Whichever philosophical route is followed, the laws will either criminalize any situation in which death results or permit death to be caused under controlled circumstances.
- Sexual and non-sexual assaults involving the use or threatened use of violence which causes injuries and which would be criminal in all other situations (e.g. sadism and masochism). In more extreme cases of edgeplay where a rape fantasy may be enacted by prior agreement, the offence of rape will not be committed because the "victim" has actually consented to sexual intercourse. The issue of consent in fact, or belief in the existence of consent, is fundamental to determining whether a rape has, or has not, been committed. In English law, for example, s74 Sexual Offences Act 2003 provides that consent is present "if he agrees by choice, and has the freedom and capacity to make that choice". If the "victim" is unconscious when penetration occurs, he would not be consenting, but this might not be rape if there is a subsisting sexual relationship, e.g. the couple are married, and the other might reasonably believe that consent to intercourse existed by virtue of that relationship. Note that, if the "victim" is physically injured, the causing of those injuries can still be charged as an assault whether there is actual consent or not. As a defence, offenders may plead that the other consented to the acts, and argue that any injuries sustained were accidental rather than intentional, leaving it to the jury to make a decision on their truthfulness.
- Pornography, which can be illegal to produce, distribute or possess in some countries, even if the participants consented to the acts, and the acts themselves are legal (see List of pornography laws by country).
- Censorship laws, such as Obscenity laws, may criminalise distribution of material even if it is only viewed by those who consent to viewing it.
- Statutory rape where the "underage" participant(s) give actual consent, but the law-makers of the relevant jurisdiction have determined that people of that age are not legally capable of giving informed consent (not informed adequately about the activity).
- The criminal transmission of HIV by consensual sexual activity infects one partner with a terminal disease which is, if not a homicide in the long term, certainly a serious injury constituting an assault in the short term. This is a complex issue because if two people, knowing the risk of transmission, voluntarily agree not to use a condom, they are consenting to an activity that risks the transmission of any sexually transmitted disease. But if one partner is aware of being HIV positive, the other partner should expect a warning or if not, at least a truthful answer to the question, so they can give informed consent. Law-makers have a policy decision to make as to whether that informed consent can excuse criminal liability.
- Adultery and, in general, sex outside marriage or other established relationships where all persons immediately involved give consent.
The issue in each of these situations is the same. Society has created a formal framework of laws to prohibit types of conduct thought to be against the public interest. Laws proscribing homicide, assaults and rape are common to most cultures. Thus, when the supposed victim freely consents to be the victim in one of these crimes, the question is whether the state should make an exception from the law for this one situation. Take euthanasia as an example. If one person intentionally takes the life of another, this is usually murder. If the motive for this is to collect the inheritance, society has no difficulty in ignoring the motive and convicting the killer. But if the motive is to relieve the suffering of the victim by providing a clean death that would otherwise be denied, can society so quickly reject the motive? It is a case of balancing the harms. On the one hand, society could impose pain and suffering on the victim by forcing him or her to endure a long decline into death. Or society could permit a system for terminating life under controlled circumstances so that the victim's wishes could be respected without exposing others to the criminal system for assisting in realising those wishes.
The other situations move down the hierarchy of non-fatal and sexual assaults with society deciding whether, and in what circumstances, to offer an excuse or exculpation to those who freely participate.
 See also
Peter McWilliams - "Aint Nobody's Business If you Do: The Absurdity of Consensual Crimes in Our Free Country" http://www.mcwilliams.com/books/books/aint/toc.htm
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