Bogaert is known for studying multiple subjects related to human sexuality, including asexuality.
These studies have concluded that the more older brothers a man has, the more likely he is to be gay, and that this effect is due to prenatal factors, not environmental ones.
[3][4][5][6] In his early career, Bogaert worked with J. Philippe Rushton to publish a paper hypothesizing biological evidence of Race differences.
Second, their data on race differences are of questionable validity because their literature review was selective and their original analyses were based on self-reports.
Third, they provided no evidence that these race differences had significant effects on reproduction or that sexual restraint is a K characteristic.