(S (S (S (NP (BASENP (NN Masturbation) (NNS rates)) (PP (IN for) (BASENP (DT both) (NNS genders)))) (VP (VBD increased) (PP (IN along) (PP (IN with) (BASENP (NN age)))))) (COMMA ,) (SBAR (IN though) (S (NP (ADVP (RB only)) (BASENP (NNS boys))) (VP (VBD were) (ADJP (ADJP (RBR more) (JJ likely)) (S (VP (TO to) (VP (VB report) (S (S (VP (VBG having) (NP (QT (DQL ``) (ADVP (RB recently)) (DQR '')) (VP (VBN engaged) (PP (IN in) (BASENP (DT the) (NN activity))))))) (SBAR (IN as) (S (BASENP (PRP they)) (VP (VBD grew) (ADJP (JJR older)))))))))))))) (PERIOD .))