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Birth control, also known as contraception and fertility control, refers to methods or devices used to prevent pregnancy. Planning and provision of birth control is called family planning. Safe sex, such as the use of male or female condoms, can also help prevent transmission of sexually transmitted infections. Contraceptive use in developing countries has cut the number of maternal deaths by 44% but could prevent 73% if the full demand for birth control were met. Because teenage pregnancies are at greater risk of poor outcomes such as preterm birth, low birth weight and infant death, some authors suggest adolescents need comprehensive sex education and access to reproductive health services, including contraception. By lengthening the time between pregnancies, birth control can also improve adult women's delivery outcomes and the survival of their children. Effective birth control methods include barriers such as condoms, diaphragms, and the contraceptive sponge; hormonal contraception including oral pills, patches, vaginal rings, and injectable contraceptives; and intrauterine devices. Emergency contraception can prevent pregnancy after unprotected sex. Long-acting reversible contraception such as implants, IUDs, or vaginal rings are recommended to reduce teenage pregnancy. Sterilization by means such as vasectomy and tubal ligation is permanent contraception. Some people regard sexual abstinence as birth control, but abstinence-only sex education often increases teen pregnancies when offered without contraceptive education. Non-penetrative sex and oral sex are also sometimes considered contraception. (via Freebase)