Human skin got less hairy as a result of rising in temperature globally and not because we started wearing clothes. Your African ancestors did not have hair despite walking around almost naked.
I think sex education should be given a high priority in the early stages in both schools and at home. Let it not be taught just to pass exams. More than that, contraceptives should be made available for these kids. Harsh punishment for any person found to have molested children should be enacted.