THE COMPLETE ARTICLES OF LOVE AND SEX: ADOLESCENCE
Early adolescence starts with puberty in both sexes. Why puberty starts when it does is uncertain but hormonal changes begin to occur a year or two beforehand and there is evidence that these affect behaviour.
Puberty is often thought of as starting at the same age in both sexes but there is little doubt that the changes occur earlier in girls. A boy’s adolescent spurt in height occurs, on average, two years after that of a girl, so for a time girls are, on average, taller than boys and may be stronger. This may partly contribute to the avoidance of girls by boys which characterises this stage. The unusually early onset of puberty is much commoner in girls than in boys and, when it occurs in boys, unlike girls, the cause is usually a disease or disorder. The late onset of puberty, in contrast, is of less medical concern in boys because perfectly normal boys may be late just as perfectly normal girls may be early.
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