Evolution depends on genes being passed down through the generations via reproduction, and same-sex sexual behavior does not result in offspring.
So, why haven't the many genes associated with same-sex sexual behavior, known as SSB-associated genes, been purged from the human genome over time? It's
Epigenetic structures appear to reduce the rate of changes in genes essential for survival and reproduction, a study finds, challenging the notion that mutations are evenly distributed throughout the genome prior to selection.