Adultery is a breach of contract.
Some guy going out and fucking women on the side you risk giving your wife an STD. Same if the wife cheats, and in many ways its fundamentally unfair for some one to work hard to support a spouse and children and then wake up your house taken away from you, your children taken away from you because your spouse decided to cheat with another person.
Which is what happens all of the time these days.
Going back to if you cheat you lose would be a fairer way of doing things.
Hell,
just look at what divorce does to the children of the couple in question. This is what I mean when I talk about societal impact, reducing this issue down to just "what two adults do in the bedroom" is absurd when the ramifications of what said adults do is extremely likely to impact the community at large:
Children in intact families have lower rates of delinquency than children in non-intact families.
23) Robert Sampson (then professor of sociology at the University of Chicago) reported, after studying 171 cities in the United States with populations over 100,000, that the divorce rate predicted the robbery rate of any given area, regardless of its economic and racial composition. In these
communities, he found that lower divorce rates indicated higher formal and informal social controls (such as the supervision of children) and lower crime rates.
24)
In 1994, it was reported in Wisconsin that the incarceration rate of juvenile delinquents was 12 times higher among children of divorced parents than among children of
married parents.
25) A 2004 study showed that children from stepparent and single mother families also have significantly higher incarceration rates than children in intact families.
26) In a British longitudinal study of males aged eight to 32, David P. Farrington, professor of criminology at Cambridge University, found experiencing parental divorce before age 10 to be a major predictor of adolescent delinquency and adult criminality.
27) Another study found that boys who go through family transitions at the age of 14 or 15 are more likely to be delinquent when they are 16 or 17.
28) Adolescents from divorced families (particularly those in divorced single-father families) display more antisocial and violent behavior than adolescents in biologically intact families.
29) An Australian parliamentary review of the literature found that divorce increases the likelihood that children will
feel hostility and rejection.
30)
Children of divorced parents are significantly more likely than children of intact married families to be delinquent by age 15, regardless of when the divorce took place.
31) A 1985 study that tracked one thousand families with children ages six to 18 for six years found that children living in intact married families exhibited the least delinquency, while children with stepfathers were more likely to exhibit the most disruptive behavior. In this study, the behavior of single-parent children fell between that of children of intact and stepfather families.
32)
Parental divorce contributes to what some studies term “externalizing behaviors,” which include weapon carrying, fighting, substance abuse, and binge drinking.
33) Another study found that the sons of divorced parents are at no greater risk of involvement in delinquent behavior than boys living in intact families if the mother and father “engage in competent parenting.”
34) Good parenting on the part of divorced fathers achieved no such effects for the daughters of divorce, according to this same study. Among adolescent girls, there is a strong correlation between family structure and delinquency,
35) hostile behavior,
36) drug use, larceny, skipping school,
37) and alcohol abuse.
38)
The point about STDs is also good as a general note in light of the fact that
Gonorrhea, Syphilis and Chlamydia are becoming drug resistant.
They're also expecting an explosion of AIDs this decade if the current cure efforts fail. It's worth noting
the secular explanation for the adoption of monogamy is because we adopted it as a survival mechanism against STDs:
Writing in the journal
Nature Communications, Bauch and his colleague Richard McElreath from the Max Planck Institute for Evolutionary Anthropology in Germany, describe how they built a computer model to explore how bacterial sexually transmitted infections such as chlamydia, gonorrhea and syphilis that can cause infertility, affected populations of different sizes. The authors considered both small hunter gatherer-like populations of around 30 individuals and large agricultural-like populations of up to 300 individuals, running 2,000 simulations for each that covered a period of 30,000 years.
In small polygynous communities, the researchers found that outbreaks of such STIs were short-lived, allowing the polygynous population to bounce back. With their offspring outnumbering those from monogamous individuals, polygyny remained the primary modus operandi.
But when the team looked at the impact of STIs on larger polygynous societies, they found a very different effect. Instead of clearing quickly, diseases such as chlamydia and gonorrhea became endemic. As a result, the population plummeted and monogamists, who did not have multiple partners, became top dog. The team also found that while monogamists who didn’t ‘punish’ polygyny could gain a temporary foothold, it was monogamists that ‘punished’ polygyny – often at their own expense of resources – that were the most successful. While the form of such punishments were not specified in the model, Bauch suggests fines or social ostracisation among the possible penalties. The results, they say, reveal that STIs could have played a role in the development of socially imposed monogamy that coincided with the rise of large communities that revolved around agriculture.