Polyamory is default for prepubescent children and non-adults and should be encouraged with the usual precautions for STDs. Encouraging monoamory among non-breeders or deferred breeders is generally toxic. In societies where women breed shortly after puberty other standards apply but given modern contraception strategies for men and women polyamory should be the rule until parenting is contemplated. I am not talking hetero only here especially prepubescent and early teen sexuality. Sow your wild oats to your hearts content on any infertile ground of either gender to determine what kind of sexuality makes sense for ones settled years.
Most couples contemplating children hetero or homo are monogamous as a tried and proven stable environment for raising children. It is not the only way but polygamy as usually practiced one male several females is usually abusive and single parenting is outrageously difficult, but possible.
If no children are planned monoamory may well be toxic. My generation gave the world the conceopt of going steady as early as high school, that is, dating only a single partner as long as the relationship lasts. The strain this puts on relationship building is overwhelming as sexuality, having fun on a date, and commitment to a single other who initially you may not know well does not work well. Even more pressure is on the relationship if pregnancy before marriage is a violation of the norm as it was when contraception was limited to condoms. Even with reliable contraception for women trying to combine sexuality, companionship, fun, and mental stimulation into a single relationship seems to put too much strain on both partners.
Sexual responsibility involves radical respect for one's partners. That means no sex until all partners think it is a good idea. Recreational sex is no exception to this general moral precept and is complicated by the evolutionary and socially reinforced expectation by women especially to associate sex with a commitment to relationship building. Relationship building is less important to men generally and women who plan to defer childbearing or eschew it altogether. Nonetheless it should be considered by both partners in any sexual relationship.
Taking the next step to parenting means preventing pregnancy until again all partners think they are ready for the responsibility of raising children financially, emotionally, and with the social support including medical that constitutes responsible parenting.u
I have recently been informed that a "Core tri" polyamorous is becoming a reasonable child raising alternative. Since I am only perpherially in the polyamory world I can only make note of the comment.
I don't see monogamy as genetic. I see it as a strongly reinforced social value. In other words nurture rather than nature. The fact that historically and prehistorically a two parent family seemed to be the only way most of the people could succeed in producing a replacement quota of adults strongly insured that the leaders who could afford to play around would preach monogamy, and believers would buy it, but as soon as the man can afford it he will play around in one way or another. They don't call prostitution the oldest profession for nothing. Or if you are rich enough you can hire massage therapists of one sex or another to accomplish the same purpose.
I am one of those preaching and practicing monogamy as long as dependent children are involved as I think that is still produces the best results as measured by high functioning adults. There are exceptions, but for every bootstrap street kid that makes it there are hundreds and maybe thousands that don't. If I were writing the laws marriage would be a commitment to any resulting children, natural or adopted, and in a divorce the only lawyer allowed would be an advocate for the children. Unfortunately the churches write the laws for both and the current disaster is the result.
However, for those who chose to accept responsibility for children whether in the usual way or by adoption, a stable family commonly reinforced by sexual bonding is an important value for society to reinforce. Unfortunately both civil and religious mores are far behind the curve on this critical issue.
I would like to see "marriage" as permission for sex completely thrown out of both civil and religious laws. The state would create family unions to protect those who choose to form families for the purpose of raising children. Religions might want to restrict "marriage" to those couples with a family union license from the state. These unions would be structured to protect the family unity with a bias toward protecting the children in the event of a separation of the adults in the union.
Social units not involving children can be handled better via contractual arrangements, pre-nups, visitation rights, wills, etc. I doubt that religions would want to be involved in blessing such arrangements.
I have no interest in solving the problem of irresponsible sexual behavior. All I am interested in solving is the problem of unplanned pregnancies and other STDs. It is quite clear that proper education in the advantages of contraception, monogamy or at least limited promiscuity, respect for ones sexual partner, and the importance of both partners being ready financially, emotionally, and socially for parenting, is effective in producing stable families, usually later in life. Teens will have sex. This is normal mammalian behavior. Giving them the information they need to have responsible sex is extremely effective in producing responsible sexual behavior.
This is why I mentioned the UU OWL curriculum. Our Whole Lives which has been around in earlier forms for over 30 years has been extremely effective in producing stable and loving families which produce planned children usually at an appropriate time in their lives. The pair bond is formed early, built on and stabilized with responsible sexuality. When the pair is ready for children they simply delete the chosen contraceptive. The stability of the pair bond is not an issue. It formed naturally at an appropriate age, survived the temptations of promiscuity, probably some tough times in the late stages of education when values and mores are tested, and survived. I can think of no stronger base for a family.
Teens and pre-teens who have used the curriculum have been followed and the results are noted above. It works. Abstinence is not part of the program but radical respect for sexual partners is. The result is monogamy and an incredibly stable pair bond. I know of a few families from the program or its equivalent who now have teenagers that they are encouraging to follow the same program. When it gets noisy in the bedroom, the parents get that "I remember that" look of great pleasure, and later there is frequently another noisy bedroom in the house. The teens are already discussing when the best time for children will be and planning their lives around that time. It is a given for them that the pair bond will last until then. It probably will.
Abstinence absent masturbation is a joke. Abstinence with masturbation is unusual. Monogamy, while certainly a worthy ideal, is an unnatural aberration for males of most species, particularly the human species. Whores, rent-a-boys, and the new wife are so common as to be considered to be the norm. Throw porn into the mix and even regulators do it.
It is called religious wishful thinking. There may be a few around who keep their penises dry, but even those who claim to do so seem to find ways of succumbing to their natural instincts.
"Substantive lying to anybody is wrong. It injures the other and is a disaster for self image. One can't hurt self or society much more grievously."
Adultery is a different issue. There are many workable forms of parenting. And to a greater extent marriage without the intent of children. Consensual open marriages. Open mistresses and concubines with the knowledge if not the blessing of the wife isn't even a biblical sin. About the only moral issue is the ability and willingness to provide proper support to the mother of any resulting children.
Adultery without spousal consent is certainly a moral issue, but with contraception and STD prevention it is probably one of the most common moral failings around. Religious or secular. And if you factor in serial monogamy as a moral failing, which I do especially with children involved, statistics are ugly for religious and secular alike, something like 30% for religious couples and 20% secular."
Pair bonded parents provide the most stable platform for child raising, particularly when both parents are committed to the child raising process. The dad provider, mom caregiver paradigm is a holdover from the patriarchal religious past, and provides an unbalanced role image for the children. Far better is two parents sharing the providing and the nurturing.
Sexual Morality
"Every atheist I know has extremely well developed and usually fairly strict moral standards with regard to sex. Without trying to speak for all atheists, I only know a few well enough to discuss sexual morality, the common thread seems to be radical respect for the feelings and integrity of the partner, and an absolute prohibition of non-consensual sex. Most heterosexual atheists consider sex with the intent to create children to be a commitment to the family to remain together at least until the children are old enough to understand any separation.
For me sexual responsibility involves radical respect for one's partner. That means no sex until both partners think it is a good idea. It means preventing pregnancy until again both partners think they are ready for the responsibility of raising children financially, emotionally, and with the social support including medical that constitutes responsible parenting. Preventing the possible transmission of STD's is usually not an issue if both partners have the same ideas about responsible sexuality. But if one has had irresponsible sex in the past that may be a consideration until medical testing confirms freedom from STDs.
This normally results in monogamy long before the monogamy is blessed by some church, but if the bond fails, as occasionally happens in spite of sexual bonding, it will happen early and before children are involved. Then the result will be serial monogamy usually on the second try.
Will it work for everybody? Of course not, but it works a lot better than denying the pair bonding efficacy of long term sexuality. And it works a lot better than trying to deny the stiffie. It seems that not even priests can do that reliably. As my favorite T-shirt says: Got a stiffie wear a Jiffy (brand condom.) The stiffie will win every time particularly if she or in some cases he is interested. It is called being mammalian.