Child and youth sexuality refers to sexual behavior and activity among children.
For example, a study on human male preferences showed that males from the age of 7 years and up tended to prefer the faces of 17-year-old girls over those of other ages. (See Sexual attraction of men.)
Sexual activity among children is often observed in nurseries.
Sexual fantasies were observed starting at the age of three
reports of homosexuals about their childhood say that they were aware of their affection to the same sex or to a certain age group and had corresponding fantasies.