(S (S (BASENP (PRP It)) (VP (ADVP (RB also)) (VP (VBZ finds) (NP (NP (BASENP (NNS boys)) (SBAR (WHNP (WP who)) (S (VBP masturbate)))) (VP (VBP are) (ADJP (ADJP (ADJP (RBR more) (JJ likely)) (S (VP (TO to) (VP (VB engage) (PP (IN in) (BASENP (JJ safe) (NN sex))))))) (PP (IN than) (NP (BASENP (NNS boys)) (SBAR (WHNP (WP who)) (S (VP (VBP do) (RB n't)))))))))))) (PERIOD .))