( ( The penis ) ( mostly ( ( consists ( of ( ( ( the urethra ) and ) ( ( three ( cylindrical bodies ) ) ( of ( erectile tissues ) ) ) ) ) ) . ) ) )
(ROOT (S (NP (DT The) (NNS penis)) (ADVP (RB mostly)) (VP (VBZ consists) (PP (IN of) (NP (NP (DT the) (NN urethra)) (CC and) (NP (NP (CD three) (JJ cylindrical) (NNS bodies)) (PP (IN of) (NP (JJ erectile) (NNS tissues))))))) (. .)))
The penis mostly consists of the urethra and three cylindrical bodies of erectile tissues.
(ROOT (S (NP (DT The) (JJ human) (NNS penis)) (VP (VBZ contains) (NP (NP (DT the) (NN urethra)) (, ,) (CONJP (RB as) (RB well) (IN as)) (NP (NP (CD three) (NNS cylinders)) (PP (IN of) (NP (ADJP (RB spongy) (JJ erectile)) (NN tissue)))))) (. .)))
The human penis contains the urethra, as well as three cylinders of spongy erectile tissue.