When two women become romantically involved as lovers, it is not a direct result of natural selection in the biological sense. Natural selection is a process that operates in the context of evolution and refers to the mechanism by which certain traits or characteristics become more prevalent in a population over time due to their survival and reproductive advantages.
Romantic or sexual orientation, including same-sex attraction, is a complex aspect of human behavior that arises from a combination of genetic, hormonal, environmental, and social factors. It is not a direct product of natural selection, as sexual orientation does not affect an individual's ability to reproduce or pass on genes directly.
However, researchers have explored potential evolutionary explanations for the persistence of same-sex attraction within human populations. Some hypothesize that same-sex attraction may have indirect effects on reproduction by contributing to the overall success and cohesion of social groups. For example, individuals who do not reproduce themselves may help support and care for the offspring of their relatives (kin selection), potentially increasing the chances of those shared genes being passed on to future generations.
It's important to understand that human behavior, including romantic and sexual orientation, is diverse and complex. There is no single explanation for why people experience same-sex attraction or become romantically involved with someone of the same gender. The understanding of human sexuality continues to evolve as we gain more knowledge and insights from various fields of research, including biology, psychology, sociology, and anthropology. Respect, acceptance, and empathy for individuals' diverse orientations and identities are essential in promoting inclusivity and understanding in society.