Scientific American: “The team of researchers, led by Kaye Wellings, a professor of sexual health at the London School of Hygiene and Tropical Medicine, analyzed nearly 200 studies on demographic sexual behavior in 59 countries published between 1996 and 2006 to obtain their results on the state of international sexual health….Contrary to popular belief, there is no evidence that young people are engaging in sexual intercourse at earlier ages–the first instance of sexual activity for both genders generally occurs at between 15 and 19 years of age globally.”