Bisexual Behavior Genetic Variants Linked to More Offspring in Heterosexual Men

Risk-taking behavior found to be the underlying cause of BSB-associated alleles' promotion of reproduction, according to a new study.

Scientists have identified genetic variations associated with male bisexual behavior, which are linked to risk-taking and having more offspring when carried by heterosexual men.
The study, led by Jianzhi Zhang from the University of Michigan, analyzed data from over 450,000 participants of European ancestry in the UK's Biobank database.
Findings suggest that male BSB-associated alleles (genetic variants associated with bisexual behavior) confer reproductive benefits due to shared genetic variants between male bisexual and risk-taking behaviors.
Male heterosexuals carrying these BSB-associated alleles father more children than average, and men who describe themselves as risk-takers tend to have more children and are more likely to carry these alleles.
However, the study also found that eSSB-associated genetic variants (associated with exclusive same-sex behavior) are correlated with fewer children, which is expected to lead to a gradual decline in their frequency over time.