Child sexual abuse (CSA) is a form of child abuse in which an adult or older adolescent abuses a child for sexual stimulation. Sexual abuse refers to the participation of a child in a sexual act aimed toward the physical gratification or the financial profit of the person committing the act. Forms of CSA 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.