For the first time, scientists have discovered a genetic variation associated with bisexual behavior in humans.

In a recent groundbreaking study, scientists have for the first time identified genetic variations associated with bisexual behavior in humans, a finding that not only challenges our understanding of the genetic basis of sexuality, but also provides a new lens through which to explore the diversity of human sexuality. The University of Michigan-led study, published Jan. 3 in the journal Science Advances, analyzed data from more than 450,000 people in the U.K. BioBank's Genetics and Health Information Database to reveal some surprising findings.

In the study, participants answered a series of questionnaires, including a question about their willingness to take risks. The analysis showed that heterosexual men with a genetic variant associated with bisexual behavior, called a BSB-related allele, had more children. In addition, those who reported engaging in adventurous behavior had more children than average and were more likely to carry the BSB-associated allele. These results suggest that male BSB-related alleles may have a reproductive advantage, which could explain their past persistence and predict their future maintenance.

Evolutionary biologist Jianzhi Zhang, senior author of the study, explains, "These results also suggest that adventurous behavior is the underlying cause of heterosexual reproduction facilitated by BSB-related alleles." He added, "That is, the reproductive advantage of the BSB-related allele is a byproduct of the reproductive advantage of adventurous behavior."

The study is part of a series of genetic studies on the impact of same-sex behavior, and Chang and study co-author Song Si-liang confirmed that the characteristics associated with same-sex and bisexual behavior are different, whereas previously they had been lumped together. We realized that in the past, people lumped all homosexual behaviors into one category, but there is actually a range," Chang said.

The senior authors of the study further explained that risky behavior is behavior that tends to seek rewards despite possible negative consequences. This could include unprotected sex and increased sexual relationships - which could lead to more children. "Nature is complex," Chang continued. "Here we discuss three characteristics: the number of children, the spirit of adventure, and bisexual behavior: they all have some common genetic basis."

Work related to human sexual behavior and genetics has long been controversial, with many fearing that if a "gay gene" could be identified, then nefarious interests might use the information to discriminate against cool kids. "We want to make it clear that our findings contribute primarily to the diversity, richness and better understanding of human sexual behavior," the authors stress. "In any case, they are not intended to imply or endorse discrimination based on sexual behavior."

This study not only provides new insights into the genetic basis of human sexuality, but also highlights the complexity of nature and the diversity of human sexuality. As science advances, we look forward to a deeper understanding of this complex topic in the future.