dramatic audio-visual material which might influence social attitudes to child sexuality are generated either in the United States of America or else for that audience. "Normative" may therefore relate to Western culture rather than to the general complexity of human experience. Historical studies Freud Until Sigmund Freud published his Three Essays on the Theory of Sexuality in 1905, children were often regarded as asexual, having no sexuality until later development. Freud was one of the first researchers to seriously study child sexuality, and his acknowledgment of its existence was a significant change. Children are naturally curious about their bodies and sexual functions – they wonder where babies come from, they notice anatomical differences between males and females, and many engage in genital play or masturbation. Child sex play includes exhibiting or inspecting the genitals. Many children take part in some sex play, typically with siblings or friends. Sex play with others usually decreases as children go through their elementary school years, yet they still may possess romantic interest in their peers. Curiosity levels remain high during these years, escalating in puberty (roughly the teenage years) when the main surge in sexual interest occurs. Kinsey Alfred Kinsey in the Kinsey Reports (1948 and 1953) included research on the physical sexual response of children, including pre-pubescent children (though the main focus of the reports was adults). While there were initially concerns that some of the data in his reports could not have been obtained without observation of or participation in child sexual abuse, the data was revealed much later in the 1990s to have been gathered from the diary of a single pedophile who had been molesting children since 1917. This effectively rendered the data-set nearly worthless, not only because it relied entirely on a single source, but the data was hearsay reported by a highly unreliable observer. In 2000, Swedish researcher Ing-Beth Larsson noted, "It is quite common for references still to cite Alfred Kinsey", due to the scarcity of subsequent large-scale studies of child sexual behavior. See also Adolescent sexuality Age of consent Developmental psychology References Further reading Childhood Sexuality and age fr:Sexualité infantile (psychanalyse)