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Human sex ratios, either at birth or in the population as a whole, are reported in any of four ways: the ratio of males to females, the ratio of females to males, the proportion of males, or the proportion of females.

If there are 108,000 males and 100,000 females the ratio of males to females is 1.080 and the proportion of males is 51.9%.

Project leader Maja Deković: ‘Most previous studies into teenage sexuality were mainly descriptive in nature, non-theoretical, with little attention for the context. If you want to gain a proper understanding about the defining factors involved in relational and sexual development, then you need to do research over a period of several years in which the social-emotional development and environmental factors are given a place.’ Over a period of four years the researchers studied almost 1300 boys and girls who at the start of the project were between 11 and 15 years old and had different levels of education.Altogether these findings suggest that even if childhood circulating estrogen concentrations are very low, they may be crucial for growth and development of healthy prepubertal children.Human exposure to putative endocrine disrupters with estrogenic and antiandrogenic properties adds further to the importance of understanding the role of estradiol in prepubertal children.Girls were in breast maturity stages 2 and 3 earlier than comparable pubic hair stages.Although breast development in girls started earlier than pubic hair development, girls completed breast and pubic hair development at approximately the same age.

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A subject almost everyone will be confronted with during the teenage years – emerging romantic and sexual feelings and ‘activities' – had never previously been investigated in such a large-scale and long-term study in the Netherlands.

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