Neurobiologist Robert Sapolsky constructed a reproductive spectrum with opposite poles being tournament species, in which males compete fiercely for reproductive privileges with females, and pair bond arrangements, in which a male and female will bond for life.
As humans societies have evolved from hunter-gatherers into civilized societies, there have been substantial changes in relations between men and women, with perhaps one of a few remaining biological constants being that both adult women and men must have sexual intercourse for human procreation to happen.
Humans have been compared to other species in terms of sexual behavior.
Just so there's no misunderstanding, God loves gay men in committed same sex partnerships and God loves lesbian women in committed same sex partnerships too.
In plainer words, God doesn't stop loving you when you're partnered or gay married, if that's legal where you live.
New types of relationships formed; it was possible for people to live together without marrying and without children.
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