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Adolescent sexuality is a stage of human development in which adolescents experience and explore sexual feelings. Interest in sexuality intensifies during the onset of puberty, and sexuality is often a vital aspect of teenagers' lives. Sexual interest may be expressed in a number of ways, such as flirting, kissing, masturbation, or sexual intercourse. Sexual interest among adolescents, as among adults, can vary greatly, and is influenced by cultural norms and mores, sex education, as well as comprehensive sexuality education provided, sexual orientation, and social controls such as age-of-consent laws. Sexual activity in general is associated with various risks and this is heightened by the unfamiliar excitement of sexual arousal, the attention connected to being sexually attractive, and the new level of physical intimacy and psychological vulnerability created by sexual encounters. The risks of sexual intercourse include unwanted pregnancy and contracting a sexually transmitted infection such as HIV/AIDS, which can be reduced with availability and use of a condom or adopting other safe sex practices. Abortion and birth control specifically reduce the chance of teenage pregnancy.