Puberty
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Puberty is something that happens in teenagers or a little earlier, and is the name for maturing into an adult. Changes that happen to a teenager's body during puberty include menstruation, the penis enlarging, breasts growing, hair growing around the genitals, under the arms, on the face and on the legs. Some people get hair on their chest or their back. Many teenagers masturbate. Something also happening in puberty, especially with boys, is the voice getting deeper, erections, and ejaculation. Girls also go through a change of voice, but it is much less marked than with boys.
In both female and male adolescent there is significant mood however what degree of mood swing varies from individual to individual.