How did homosexuality evolve? There might be a clue in our genes

Genetic effects associated with same-sex sexual behavior are also associated with a mating advantage among people who engage only in opposite-sex sexual behavior, according to a study involving participants from the United States and United Kingdom published in Nature Human Behaviour. However, the authors caution that the genetic differences studied here are small, are spread throughout the human DNA sequence and capture only a small portion of the heritability of same-sex sexual behavior. Further research is needed to confirm whether these findings apply to the wider human population.