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Several researchers have suggested that ovulation may not be concealed in humans living under natural conditions with minimal hygiene. Because measuring coital frequency in such a population is problematic, I tested this proposition indirectly by asking Hadza hunter-gatherers of Tanzania when a...
A representative community sample of Hong Kong boys ( n = 1,024) and girls ( n = 1,403), age 14–18 years, provided information regarding same-sex attraction, gender dissatisfaction, pubertal timing, early experience with sexual intercourse, and depressive symptoms. They also rated the quality...
The relation between birth order and number of sexual and violent convictions was investigated retrospectively in a sample of 113 men, to determine whether the established fraternal birth order effect in male homosexual preference and deviant sexual preference (e.g., for rape and pedophilia) may...
The neurohormonal theory of sexual orientation proposes that homosexual men and homosexual women are exposed prenatally to a hormonal environment that is similar to that of the other sex. Prenatal exposure to an opposite-sex hormonal environment may lead the nervous system to develop in a manner...
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