Abstract
Human sexual orientation has been widely debated, with various theories attempting to explain its origin and development. This study proposes that sexual orientation has a genetic basis and is influenced by the interaction of a specific gene, which I refer to as GenH. From an evolutionary perspective, I analyze its possible presence and evolution from apes to hominids, through the Homo species, and its transition to modern Homo sapiens. The results suggest that GenH plays a key role in the diversity of sexual orientations, including homosexuality and bisexuality, and that its expression occurs during embryonic development. This would indicate that gender identities and sexual orientations—male, female, homosexual, bisexual, and others—are biologically determined at birth, rather than being solely shaped by social or environmental influences. This study challenges traditional paradigms about sexuality and gender, inviting the scientific community to further investigate GenH and its impact on human identity and sexual orientation. The hypothesis suggests that this gene has been embedded in the genetic code of our species since its origins, reinforcing the idea that sexual diversity is an intrinsic component of human nature.