Historically, 20% of men obtain 80% of women. Monogamy is not the natural state for humans. The natural state is a male with multiple females; confirmed by genetics. Women are naturally bi-sexual because that provides a sexual display elevating insemination probability. It's a highly successful breeding strategy. Which generally locks in resources. Meaning the strategy successfully results in a next generation. Genetically women have a natural tendency for close, collective, "sisterhood" bonding because this is their natural state in a harem. They closely support each other but remain fiercely competitive for the attention of men (their shared man). This is commonly observed everywhere today. And their cycles sync to facilitate this strategy. Even today, where polygamy is common, women are fully supportive of this concept so long as they are well cared for and their status remains. It's society which teaches them jealously and cattiness toward other potential sisters-wives. Also worth pointing out, even biblically it does not oppose polygamy nor female bi-sexuality. So long as a women accepts the seed of a man, (nearly) anything is fair game for display. The bible does condemn the paganistic rituals of sex magic for women which includes adultery, whoring, promiscuity, and beastiality. At the same time, the bible is also very clear that male homosexuality is a sin and an abomination. I assume because of anal sex, disease, uncleanliness, and the pursuit of carnal pleasures over that of multiplying and spreading your seed. None of which need apply to bi-sexual women accepting sperm as described above. Of course, many church teachings directly conflict with what the bible says, but the above is what it actually says on the topic.