All teenage boys, save a few really dorky ones, classify teenage girls into three catagories based exclusively on appearance.  The percentage numbers follow a bell curve distribution such that only about 15% are considered "hot", only about 15% are judged "untouchables", and of course the 70% majority populate the "normal" group.  At some point before age 30 these same boys will succeed in subcatagorizing each "teenchick"group such that everything will not come up roses for all "hot chicks" nor will life be but a sad little affair for all "untouchables".  A few in both catagories will migrate up or down based on unforseen physical changes and many will shift up/down the gradient based on personality which is to say, a combination of intelligence and values.  Throughout history, it's interesting to note that for every "teenchick" generation, as time passes, the shift from both "hot" and "untouchable" to "normal" is many times greater than the shift to "hot" and "untouchable".  The explanation is that very many "hot" teenchicks, from there high ego state, fail to develop mature personality traits, while very many "untouchables", utilize their more isolated teen status to build mature personalities.  Indeed, it is but a rare few of the "hot" teenchicks that are able to stay the course through their season of adoration and build attractive personalities.  Those forever "hot" few that do stay focused on intelligence/values become the model for the next generation.  Those who do not are destined to know the lifelong trials of "normal" or the anguish of "untouchable"