'An Bogaerts' in OBA Collectie

Numerous studies indicate that homosexual men have, on average, more older brothers than do heterosexual men. One explanation of the "older brother" effect comes from D.J. Bern (1996), who argued that an increased number of older brothers in homosexual...

Investigated was whether homosexual men have a higher mean birth order than heterosexual men primarily because they have more older brothers or because they have more older siblings of both sexes. 302 homosexual men were individually matched on year of...

The relations between sexual orientation and age of puberty in both men and women were examined in a national probability sample of the United States. The sample was the National Health and Social Life Survey (E.O. Laumann, J.H. Gagnon, R.T. Michael, &...

In men, sexual orientation correlates with the number of older brothers, each additional older brother increasing the odds of homosexuality by approximately 33%. However, this phenomenon, the fraternal birth order effect, accounts for the sexual orienta...