(QT (DQL ``) (QTC (S (S (NP (ADJP (JJ Many)) (NP (ADJP (JJ adolescent)) (BASENP (NNS boys) (CC and) (NNS girls)))) (VP (VB masturbate))) (CONJP (COMMA ,) (CC and)) (S (PP (IN among) (BASENP (ADJP (RB sexually) (JJ active)) (NNS teens))) (S (BASENP (NN masturbation)) (VP (VBZ is) (VP (VBN associated) (PP (IN with) (NP (BASENP (JJ other) (JJ sexual) (NNS behaviors)) (CC and) (BASENP (NN condom) (NN use))))))))) (PERIOD .)) (DQR ''))