Adolescence is fundamentally a period of physical and physiological changes. The young person’s reactions to physical changes may range from pride and pleasant expectation to bewilderment and fear. When adolescents evaluate each other, especially when they consider qualities they like in a manner of the opposite sex, “good looks” are often mentioned. In particular they dominate in descriptions of girls than of boys but other physical characteristics such as body build, height and the like are often noted when boys are being “sized up”. One of the most characteristic features of adolescence is the increase in size i.e. in height and weight. However, the beginning of adolescence, known as pubescence, brings with it abrupt and psychologically significant physical changes. While many of these physical changes, such as growth in height and deepening of the voices are obvious and commonly known, others are hidden or less obvious but nonetheless significant.