It is organized into three quatrains and a final rhyming couplet; infact, it is an Elizabethan Sonnet.

In the first quatrain the interlocutor gives a piece of advice to his addressee who is a beautiful and young man.

Its function is to introduce the topic of the Sonnet: In this case the interlocutor invites the man to have a baby and so to bless a mother.

In the second quatrain he supports his thought and tries to persuade the man: he underlines the importance of remaining alive in  posterity.

In the third, and last, quatrain the speaking voice says that at his age  the fair  youth would better becomea father and so, pass on his beauty.

In the final rhyming couplet, the interlocutor invites the beautiful man to marry.