Why Is Being Gay Considered “Amoral”? [I Am LGBT Friendly]

The most likely scenario is that people are greedy. After the Younger Dryas period 12,000 years ago humans were just about extinct. Most of the large fauna were less and farming was just bring discovered. People lived in clans. They needed to protect their land and hunting grounds. Marriage or at least pairing may have started. Biology suggests that earlier human mating rituals involved multiple partners which resulted in actual changes to human bodies. Sexually transmitted diseases may not have existed yet but exchanges of women between clans likely occurred but there likely was an uneasy peace. Keeping the strength of the clan up required children to be born. Likely it was decided that men needed to be fathers and to do otherwise weakened the clan/tribe. Now it's for religious reasons that groups insist on having lots of children so as to become the dominant religion in a region and take over the land for habitation.