@Dragline:
Since I believe that human beings are generally as flexible and varied in the realm of sexual strategies/preferences as they are in the realm of food strategies/preferences, I don't think that normative metrics or discussions about what constitutes "natural" are all that useful. However, it is interesting to note that recent genetic studies revealing ratio of archaic fathers to mothers of current human population do roughly correlate with generalized primate rule of thumb that assigns species polygyny/monogamy ratio based on relative size of males to females. Humans fall out at around 1.5 females/male on this range. So, it is interesting to consider how cultural/economic forces can push the ratio in one direction or the other.
It is my belief that the overall ratio doesn't really vary that much, but the way in which it manifests can vary considerably. For instance, it is generally well accepted practice in our culture to have sex with your beloved wife, but also make occasional "use" of pornography. Line starts to blur somewhere along the continuum of eyes-rolled amusement because you didn't hear what your wife was saying when the 22 year old waitress was bending over in her short skirt, and the credit card statement with multiple charges at New Tokyo Health Spa.
Chad wrote:Not sure why anyone in a relationship with 3 or more even wants to add the word marriage to it. Thus, no polygamy. I'm all for non-traditional relationships. Though, overall, Draglines negative, creates an over-supply of single men with nothing to do but stir up trouble , is a serious concern if it ever became common.
Books written by 30-something year old men in our culture will sometimes indicate that there are two sexual strategies followed by human males. An early promiscuous wild dispersal of seed without responsibility/authority phase vs. a pair-bonding help with nesting/feeding of young strategy. Since I have interacted with a variety of men, varying in age from 16 to 70, it is my opinion that there are actually 3 rough strategies followed by human males*, and the 3rd is polygyny. Which of these 3 strategies an individual will use will depend on socio-economic factors, personality, age and personal resource base or realm of dominance. IOW, the answer to your question is that an older man with an extensive resource base will generally tend towards preference towards making some ongoing contractual use of resource base when forming or maintaining sexual/romantic/affectionate/practical/social relationships with any number of females. IOW, (another terrible analogy to follow) same reason why it is commonplace for wealthy older men to own many cars, even if they don't drive them very often, but very uncommon for wealthy older men to choose to hot-wire a car and go for a joyride.
Anyways, since "Discards: Your Way to Wealth" is one of my primary life manuals, I do not view the possibility of an over-supply of single men OR the reality of a demand on the market for multiple "wives" as a huge problem. The simple solution is more females offering short-term contracts with overt terms, and more men and women practicing polyamory. I have recently been offered open-end contract of support as affectionate travel companion for older, affluent man with freedom to take younger partners myself, and I am giving it some consideration. **
*And consequently human females also. Chicken/egg. Depends on perspective/model. If a female agrees to be a faithful second "wife" then she is practicing polygyny, as opposed to polygamy or poly-amory. To my chagrin, I must admit that I accepted a contract on these terms on one occasion, but then broke it a month later.
https://en.wikipedia.org/wiki/Polygyny_threshold_model
**However, I would note for the record that what I might choose to do, and what I would advise my DD26,who has her child-bearing/rearing years ahead of her still, to do would vary considerably.