Rethinking puberty: The development of sexual attraction
Recent findings from three distinct and significant studies have pointed to the age of 10 as the mean age of first sexual attraction - well before puberty, which is typically defined as the age when the capacity to procreate is attained (Timiras, 1972). These findings are at odds with previous developmental and social science models of behavioral sexual development in Western countries, which suggested that gonadarche (final maturation of the testes or ovaries) is the biological basis for the child's budding interest in sexual matters. Earlier studies postulated that the profound maturational changes during puberty instigate the transition from preadolescence to adult forms of sexuality that involve sexual attraction, fantasy, and behavior (Money & Ehrhardt, 1972). Thus, adult forms of sexuality were thought to develop only after gonadarche, typically around ages 12 for girls and 14 for boys, with early and late bloomers being regarded as "off time" in development (Boxer, Levinson, & Petersen, 1989). But the new findings, which locate the development of sexual attraction before these ages, are forcing researches to rethink the role of gonadarche in the development of sexual attraction as well as the conceptualization of puberty as simply the product of complete gonadal maturation.
Many researches have conflated puberty and gonadarche, thinking that the two are synonymous in development. The new research on sexual orientation has provided data that invalidate the old model of gonadarche as the sole biological cause of adult forms of sexuality. To the extent that sexual attraction is affected by hormones, the new data indicate that there should be another significant hormonal event around age 10. Indeed, there is: the maturation of the adrenal glands during middle childhood, termed adrenarche. (The adrenal glands are the biggest nongonadal source of sex steroids.) This biological process, distinctively different from gonadarche, may underlie the development not only of sexual attraction, but of cognition, emotions, motivations, and social behavior as well. This observation, in turn, leads to a redefinition of prepubertal and pubertal development.
bron: Article 'Rethinking Puberty: The Development of Sexual Attraction' by Martha K. McClintock & Gilbert Herdt; homepage.univie.ac.at/michael.berger/lit/McClintock.pdf; Current Directions in Psychological Science, Vol. 5, No. 6; December 1996