Sex is more than just having heterosexual sexual intercourse. Sexual development is a process that occurs throughout the lifespan: influenced by biological, psychological, social and cultural factors. Much of the data on sexuality come from self-reports, so may be subject to reporting biases such as exaggeration and purposeful concealment: may be subject to errors due to loss of memory about specific events. There is a widespread belief that children are not sexual beings and should not be exposed to questions about sex. The studies of child and adolescent sexual behaviour have mostly involved surveys that have used either questionnaire or interviews. The sexual attitudes and behaviour of children and adolescents in canada are affected by culture: causes a lot of conflict between parents and children who are trying to match the expectations of sexuality of the dominant culture. Before 1890, it was thought that sexuality was something that magically appeared at puberty.