Question

In girls when mensuration cycle starts we get to know, so is their any signal through which boys can know that now they can reproduce.

Answer 1

In boys puberty indicates that they can now reproduce. The signs of puberty are boys observe hair growth at underarms,genitals and face. Their voice gets deeper, and they become more strong. Along with that they experience spontaneous ejaculation and erection during sleep. The ejaculation during sleep is known as wet dream. This is how boys get to know that they can reproduce now.