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"Exposed yin addiction" is a type of sexual abnormality, also known as "exposed genitals." Its characteristic is to expose the genitals of the opposite sex in an inappropriate environment and cause the tension emotional response of the opposite sex to obtain satisfaction or pleasure, but there is no sexual deviation phenomenon in which further sexual behavior is applied to the opposite party. It usually occurs in men. The ratio of male to female is 4: 1, and most of them are unmarried young men (prone to occur between 25 and 35 years old). Occurrence in later years often indicates severe mental illness or organic damage. The exposed subjects are mostly young and heterosexual people who are acquainted with each other, with varying degrees of exposure. Most men only show genitals, women show breasts, and few expose the whole body.