"While the records for very young boys are fewer than for boys nearer the age of adolescence and while the calculations for these youngest cases are consequently less reliable, the data do show a gradual increase, with advancing age, in the percentage of cases able to reach climax: 32 per cent of the boys 2 to 12 months of age, more than half (57.1%) of the 2- to 5- year olds, and nearly 80 per cent of the pre-adolescent boys between 10 and 13 years of age (inclusive) came to climax. Half of the boys had reached climax by age 7 years of age (nearly half of them by 5 years), and two-thirds of them by 12 years of age. The observers emphasize that there are some of these pre-adolescent boys (estimated by one observer as less than one quarter of the cases) who fail to reach climax even under prolonged and varied and repeated stimulation; but, even in these young boys, this probably represent psychologic blockage more often than physiologic incapacity. In the population as a whole, a much smaller percentage of the boys experience orgasm at any early age, because few of them find themselves in circumstances that test their capacities; but the positive record on these boys who did have the opportunity makes it certain that many infant males and younger boys are capable of orgasm, and it is probable that half or more of the boys in an uninhibited society could reach climax by the time they were three or four years of age, and that nearly all of them could experience such a climax three to five years before the onset of adolescence."