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Teenage sexuality and its most salient components — rogue hairs, crushing desire, confusing tumescence, and the looming specter of unplanned pregnancy — are of perennial concern to dewy-skinned adolescents and wizened adults alike. Helping the young navigate these choppy waters can be ticklish; writing a guide about it even more so. Jane Fonda is the latest to bestow her grown-up wisdom on our nation’s youth.