The mark of sexual maturation for a boy that is most comparable to menarche for a girl is

In a boy, the mark of sexual maturation that is most comparable to menarche for a girl is the increment of the penis size, both in length and width, and the enlargement of both the scrotum and testes.  

Further Explanation:

Aside the above mentioned, a boy also begin to have broad chest, and also he becomes more muscular which makes him to be capable to do more physical activities than he could do when he was more younger.

He also experiences rapid hair growth all over his body, more specifically, on his face, chests, legs and around his penis area. He also experience wet dreams whenever he is asleep, thereby ejaculating which connotes the release of some liquid substances called sperm.

For a boy to experience growth in his penis, testes, scrotum, and other physical changes, he must have hit his puberty years, which can be termed as sexual maturation.

Sexual maturation can be referred to stages of pubertal maturity and development that occur in the life of males and females; and are usually characterized by inevitable physical alteration. Recently sexual maturation has been experienced in the life of males and females earlier than it used to occur some decades ago, and this is as a result of improved nutrition, adequate living conditions, and overall human health.

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