| http://www.w3.org/ns/prov#value | - By the ninth grade, more than one-third of adolescents have had sexual intercourse; by grade 12, nearly two-thirds are sexually experienced.1 Sexually active adolescents tend to have multiple partners (consecutively or concurrently) and to be inconsistent in their practice of safer sex.2 The combination of these factors places adolescents at risk for unplanned pregnancies and STDs, including HIV.
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