I think that it's necessary to start leading an active sex life when a person is fully aware of his full responsibility and knows about the consequences that may be after sex. Starting from sexually transmitted diseases and ending with pregnancy. Now, if you believe the information on the Birth Control portal, there are very contraceptives that have different active substances and mode of action, but are used to prevent pregnancy (hormonal patch, for example) and the transmission of sexually transmitted diseases (female, male condoms). The most common option is oral contraceptives. Very often they are prescribed in adolescence, not because a girl has an active sex life, but to normalize hormonal levels during puberty (get rid of acne, remove or reduce pain during menstruation, normalize the work of sweat glands). But only a qualified specialist is able to select and prescribe any hormone pills for you.