include asking or pressuring a child to engage in sexual activities (regardless of the outcome), indecent exposure of the genitals to a child, displaying pornography to a child, actual sexual contact with a child, physical contact with the child's genitals, viewing of the child's genitalia without physical contact, or using a child to produce child pornography. Selling the sexual services of children may be viewed and treated as child abuse rather than simple incarceration. Effects of child sexual abuse on the victim(s) include guilt and self-blame, flashbacks, nightmares, insomnia, fear of things associated with the abuse (including objects, smells, places, doctor's visits, etc.), self-esteem difficulties, sexual dysfunction, chronic pain, addiction, self-injury, suicidal ideation, somatic complaints, depression, PTSD, anxiety, other mental illnesses including borderline personality disorder and dissociative identity disorder, propensity to re-victimization in adulthood, bulimia nervosa, and physical injury to the child, among other problems. Children who are the victims are also at an increased risk of sexually transmitted infections due to their immature immune systems and a high potential for mucosal tears during forced sexual contact. Sexual victimization at a young age has been correlated with several risk factors for contracting HIV including decreased knowledge of sexual topics, increased prevalence of HIV, engagement in risky sexual practices, condom avoidance, lower knowledge of safe sex practices, frequent changing of sexual partners, and more years of sexual activity. , in the United States, about 15% to 25% of women and 5% to 15% of men were sexually abused when they were children. Most sexual abuse offenders are acquainted with their victims; approximately 30% are relatives of the child, most often brothers, sisters, fathers, mothers, uncles or cousins; around 60% are other acquaintances such as friends of the family, babysitters, or neighbours; strangers are the offenders in approximately 10% of child sexual abuse cases. In over one-third of cases, the perpetrator is also a minor. In 1999 the BBC reported on the RAHI Foundation's survey of sexual abuse in India, in which 76% of respondents said they had been abused as children, 40% of those stating the perpetrator was a family member. United States federal prosecutors registered multiple charges against a South Korean man for reportedly running the world's "largest dark web child porn marketplace." Reportedly, the English translated website "Welcome to Video", which has now been taken consisted of more than 200,000 videos or 8TB of data showing sexual acts involving