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What is Voyeurism and explain in detail?
Voyeurism is the sexual interest in or practice of watching other people engaged in intimate behaviors, such as undressing, sexual activity, or other actions usually considered to be of a private nature.The term comes from the French voir which means "to see". A male voyeur is commonly labelled as "Peeping Tom" or a "Jags", a term which originates from the Lady Godiva legend. However, that term is usually applied to a male who observes somebody secretly and, generally, not in a public space.
The American Psychiatric Association has classified certain voyeuristic fantasies, urges and behaviour patterns as a paraphilia in the Diagnostic and Statistical Manual (DSM-IV) if the person has acted on these urges, or the sexual urges or fantasies cause marked distress or interpersonal difficulty. It is described as a disorder of sexual preference in the ICD-10. The DSM-IV defines voyeurism as the act of looking at "unsuspecting individuals, usually strangers, who are naked, in the process of disrobing, or engaging in sexual activity". The diagnosis would not be given to people who experience typical sexual arousal simply by seeing nudity or sexual activity. In order to be diagnosed with voyeuristic disorder the symptoms must persist for over six months and the person in question must be over the age of 18.

Historical perspectives
There is relatively little academic research regarding voyeurism. When a review was published in 1976 there were only 15 available resources. Voyeurs were well-paying hole-lookers in especially Parisian brothels, a commercial innovation described as far back as 1857 but not gaining much notoriety until the 1880s, and not attracting formal medical-forensic recognition until the early 1890s. Society has accepted the use of the term voyeur as a description of anyone who views the intimate lives of others, even outside of a sexual context. This term is specifically used regarding reality television and other media which allow people to view the personal lives of others. This is a reversal from the historical perspective, moving from a term which describes a specific population in detail, to one which describes the general population vaguely.
One of the few historical theories on the causes of voyeurism comes from psychoanalytic theory. Psychoanalytic theory proposes that voyeurism results from a failure to accept castration anxiety and as a result of failure to identify with the father.

Prevalence
Voyeurism has high prevalence rates in most studied populations. Voyeurism was initially believed to only be present in a small portion of the population. This perception changed when Alfred Kinsey discovered that 30% of men prefer coitus with the lights on. This behaviour is not considered voyeurism by todays diagnostic standards, but there was little differentiation between normal and pathological behaviour at the time. Subsequent research showed that 65% of men had engaged in peeping, which suggests that this behaviour is widely spread throughout the population. Congruent with this, research found voyeurism to be the most common sexual law-breaking behaviour in both clinical and general populations.

An earlier study, based on 60 college men from a rural area, indicates that 54% had voyeuristic fantasies, and that 42% had tried voyeurism, concluding that young men are more easily aroused by the idea.In a national study of Sweden it was found that 7.7% of the population (16% of men and 4% of women) had engaged in voyeurism at some point. It is also believed that voyeurism occurs up to 150 times more frequently than police reports indicate. This same study also indicates that there are high levels of co-occurrence between voyeurism and exhibitionism, finding that 63% of voyeurs also report exhibitionist behaviour.

Characteristics
People engage in voyeuristic behaviours for diverse reasons, but statistics can indicate which groups are likelier to engage in the act.
Early research indicated that voyeurs were more mentally healthy than other groups with paraphilias. Compared to the other groups studied, it was found that voyeurs were unlikely to be alcoholics or drug users. More recent research shows that, compared to the general population, voyeurs were moderately more likely to have psychological problems, use alcohol and drugs, and have higher sexual interest generally. This study also shows that voyeurs have a greater number of sexual partners per year, and are more likely to have had a same-sex partner than most of the populations. Both older and newer research found that voyeurs typically have a later age of first sexual intercourse. However, other research found no difference in sexual history between voyeurs and non-voyeurs. Voyeurs who are not also exhibitionists tend to be from a higher socioeconomic status than those who do show exhibitionist behaviour.

Gender differences
Research shows that, like almost all paraphilias, voyeurism is more common in men than in women. However, research has found that men and women both report roughly the same likelihood that they would hypothetically engage in voyeurism. There appears to be a greater gender difference when actually presented with the opportunity to perform voyeurism. There is very little research done on voyeurism in women, so very little is known on the subject. One of the few studies deals with a case study of a woman who also had schizoid personality disorder, which limits the degree to which it can generalize to normal populations.A 2021 study found that 36.4% of men and 63.8% of women were strongly repulsed by the idea of voyeurism. Men were more likely to be mildly or moderately aroused than women, but there was little gender difference among those who reported strong arousal. Men reported slightly higher willingness to commit voyeurism but, when risk is introduced, willingness diminishes in both sexes proportionally to the risk involved. Individual differences in sociosexuality and sexual compulsivity were found to contribute to the sex differences in voyeurism.

Current perspectives
Lovemap theory suggests that voyeurism exists because looking at naked others shifts from an ancillary sexual behaviour, to a primary sexual act. This results in a displacement of sexual desire making the act of watching someone the primary means of sexual satisfaction.
Voyeurism has also been linked with obsessive–compulsive disorder (OCD). When treated by the same approach as OCD, voyeuristic behaviours significantly decrease.

Treatment
Professional treatment
Historically voyeurism has been treated in a variety of ways. Psychoanalytic, group psychotherapy and shock aversion approaches have all been attempted with limited success. There is some evidence which shows that pornography can be used as a form of treatment for voyeurism. This is based on the idea that countries with pornography censorship have high amounts of voyeurism. Additionally shifting voyeurs from voyeuristic behaviour, to looking at graphic pornography, to looking at the nudes in Playboy has been successfully used as a treatment. These studies show that pornography can be used as a means of satisfying voyeuristic desires without breaking the law.
Voyeurism has also been successfully treated with a mix of anti-psychotics and antidepressants. However the patient in this case study had a multitude of other mental health problems. Intense pharmaceutical treatment may not be required for most voyeurs.There has also been success in treating voyeurism through using treatment methods for obsessive compulsive disorder. There have been multiple instances of successful treatment of voyeurism through putting patients on fluoxetine and treating their voyeuristic behaviour as a compulsion.

Techniques
The increased miniaturisation of hidden cameras and recording devices since the 1950s has enabled those so minded to surreptitiously photograph or record others without their knowledge and consent. The vast majority of mobile phones, for example, are readily available to be used for their camera and recording ability.

Criminology
Non-consensual voyeurism is considered to be a form of sexual abuse.
When the interest in a particular subject is obsessive, the behaviour may be described as stalking.
The United States FBI assert that some individuals who engage in "nuisance" offences (such as voyeurism) may also have a propensity for violence based on behaviours of serious sex offenders.  An FBI researcher has suggested that voyeurs are likely to demonstrate some characteristics that are common, but not universal, among serious sexual offenders who invest considerable time and effort in the capturing of a victim (or image of a victim); careful, methodical planning devoted to the selection and preparation of equipment; and often meticulous attention to detail.Little to no research has been done into the demographics of voyeurs.

Legal status
Voyeurism is not a crime at common law. In common law countries it is only a crime if made so by legislation.
In Canada, for example, voyeurism was not a crime when the case Frey v. Fedoruk et al. arose in 1947.  In that case, in 1950, the Supreme Court of Canada held that courts could not criminalise voyeurism by classifying it as a breach of the peace and that Parliament would have to specifically outlaw it.  On November 1, 2005, this was done when section 162 was added to the Canadian Criminal Code, declaring voyeurism to be a sexual offence when it violates a reasonable expectation of privacy. In the case of R v Jarvis, the Supreme Court of Canada held that for the purposes of that law, the expectation of privacy is not all-or-nothing; rather there are degrees of privacy, and although secondary-school pupils in the school building cannot reasonably expect as much privacy as in the bedroom, nonetheless they can expect enough privacy so that photographing them without their consent for the purpose of sexual gratification is forbidden.In some countries voyeurism is considered to be a sex crime. In the United Kingdom, for example, non-consensual voyeurism became a criminal offence on May 1, 2004. In the English case of R v Turner (2006), the manager of a sports centre filmed four women taking showers. There was no indication that the footage had been shown to anyone else or distributed in any way. The defendant pleaded guilty. The Court of Appeal confirmed a sentence of nine months imprisonment to reflect the seriousness of the abuse of trust and the traumatic effect on the victims.
In another English case in 2009, R v Wilkins (2010), a man who filmed his intercourse with five of his lovers for his own private viewing was sentenced to eight months in prison and ordered to sign onto the Sex Offender Register for ten years. In 2013, 40-year-old Mark Lancaster was found guilty of voyeurism and jailed for 16 months, after he tricked an 18-year-old student into traveling to a rented flat in Milton Keynes, where he filmed her with four secret cameras dressing up as a schoolgirl and posing for photographs before he had sex with her.In a more recent English case in 2020, the Court of Appeal upheld the conviction of Tony Richards after Richards sought "to have two voyeurism charges under section 67 of the Sexual Offences Act dismissed on the grounds that he had committed no crime". Richards "secretly videoed himself having sex with two women who had consented to sex in return for money but had not agreed to being captured on camera". In an unusual step, the court allowed Emily Hunt, a person not involved in the case, to intervene on behalf of the Crown Prosecution Service (CPS). Hunt had an ongoing judicial review against the CPS since the CPS had argued that Hunts alleged attacker had not violated the law when he "took a video lasting over one minute of her naked and unconscious" in a hotel room on the basis that there should be no expectation of privacy in the bedroom. However, in terms of what is considered a private act for the purposes of voyeurism, the CPS was arguing the opposite in the Richards appeal