For boys, the event that most closely parallels menarche is:

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Spermarche, also known as the first ejaculation or the beginning of sperm production, is the event in boys that is most similar to menarche in girls. It marks the onset of fertility and a significant change in their reproductive system. While penis growth and pubic hair growth also occur during puberty, they do not represent the same significant milestone as menarche or spermarche. First intercourse is a social and cultural event, rather than a physiological marker of development.

For Boys, the Event That Most Closely Parallels Menarche Is