 In a 2011 study by the CDC, 7.1% of females and 2.1% of males aged 15–24 were infected with chlamydia, historically the most prevalent of all STIs in the general population (after HPV).The earlier onset of puberty can produce sexual drives at a time when teens are not yet fully socialized to understand the potential social and emotional consequences of sexual activities.Some scholars claim that the risk for depression is "clearly elevated" for the sexually active of either gender.