During the long process of civilization of human society, many behaviors of members of human society that are common in other species of animals in the animal kingdom have become perversions that are not accepted by human civilization. Among them, sexual perversions, which are often reported in the press, often become the topic of discussion, and individuals who commit sexual perversions become the “public enemy” of a thousand people. Because the majority of sexual perversions are minor and do not pose a substantial threat to the life of the victim, but may cause internal damage to the victim, social governing bodies often treat them as public order cases, with the individual committing the sexual perversion being subjected to administrative punishment, mainly public order detention. In fact, from a psychiatric perspective, sexual deviance is characterized by certain abnormalities in mental activity, such as uncontrollable impulses to commit sexual deviance, repetitive repetition, persistent teaching, abnormal sexual orientation and lack of ability to obtain sexual pleasure through regular sexual activities. Some researchers have even found that individuals who commit sexual deviant behavior are usually introverted, timid and weak. Moreover, modern psychiatry has found that most sexual deviant behaviors may have some biological basis, as well as corresponding social and psychological factors. Because of this, certain sexual deviant behaviors may be corrected through psychiatric interventions. The author presents here several common sexual deviant behaviors that may help the reader to recognize the psychopathological features of such behaviors. Exhibitionism is one of the common sexual deviant behaviors and is only seen in males, mostly in young adults. Individuals who exhibit this behavior often develop it gradually after puberty. They choose to hide behind trees or on street corners in the late evening or early morning when the sun is shining, in relatively quiet and sparsely populated alleys or side streets. When a young woman who meets their internal criteria approaches their hiding place, and when they can see the outline of the woman’s features, they will suddenly barge in front of her, drop their pants, reveal their penises, and start masturbating. If the woman is frightened, screaming and running away will make them have more intense sexual pleasure and reach orgasm sooner. The perverted behavior of these exhibitionists is limited to exposing their genitals and masturbating throughout the process of exhibitionism, with no intention of further sexual assault on the woman. In addition to being secluded and sparsely populated, the locations they chose for their exhibitionist behavior were often characterized by roads that were conducive to escape, get away, or hide at any time so that they could escape punishment. The frequency of their exhibitionist behavior may also be phased: it may be more frequent at one time and less frequent at another. In addition, they perform such acts in relation to the seasons, occurring more often in spring and summer than in winter. Voyeurism Voyeurism is also a relatively common form of sexual deviance. Those who engage in this type of behavior are also male and are mostly young. The object or content of their voyeurism may be both the ongoing sexual activity and the external genitalia of women. These people’s voyeurism and voyeurism can be described as a variety of ways, both the most direct visual peeping, but also with the help of tools such as reflectors, cameras, cameras and other indirect peeping. Most voyeurs in the direct voyeurism will be implemented at the same time masturbation and other sexual acts, and indirect voyeurism with the help of cameras or cameras, if not found on the spot when the possibility of masturbation, often at the same time. Those who take pictures or record images with the help of cameras or video cameras often engage in masturbation while the contents are being shown in private. As the technology and facilities for obtaining images have advanced, the means and methods used by voyeurs have also continued to evolve to the point of being unpreventable. From time to time, there have been some staggering reports in various media, such as people installing extremely hidden, Bluetooth transmission-connected cameras in high-class hotel rooms, and people placing cameras mounted on plungers in women’s restrooms, which are no more than tools to replace live voyeurism and spy on other people’s sexual activities in guest rooms and women’s urination and defecation activities or external genitalia, respectively. Friction fetish Friction fetish is also a relatively common form of sexual deviance. The people who commit this sexual perversion are also basically male, but the age is not only limited to young people, there are some older people. They are mostly in crowded occasions, as close as possible to the young woman as their chosen target, with their arms or chest close to certain sexually significant parts of the woman’s body such as breasts, buttocks, perineum, etc., and move their arms or chest in contact with these parts of the woman, in the process of friction to generate sexual pleasure. Of course, there are also many daring people who directly rub their erect penis against women’s bodies through their clothes and even ejaculate during the rubbing process to reach orgasm. Fetishism Another sexual perversion worth mentioning here is fetishism. Fetishism is also seen only in males and has a slightly wider age range, from adolescents to middle-aged people, and even older people. Typical fetish behavior takes the form of a male individual stealing intimate objects such as bras, panties, stockings, high heels, or appendages of the female body such as hair and pubic hair that come in contact with parts of the female sex symbol, and then kissing, smelling, licking, or fondling these objects and sexual fantasies, supplemented by masturbation, to obtain sexual pleasure. Some of these people may masturbate at the scene immediately after the theft, but most engage in the above sexual perversions in a private space. Regardless of the type of sexual deviant behavior described above, the desire, impulsiveness, and tension that precede the act and the release of tension after the act are characteristics that are also seen in “impulse control disorders” such as hair pulling, skin picking, kleptomania, and pathological gambling. Psychiatric treatments for impulse control disorders may therefore be effective for these types of sexual deviant behaviors.