In the 1960s, anthropologist William Davenport lived among a group of Melanesian islanders who regarded sex as natural and uncomplicated. All the women claimed to be highly orgasmic, with most reporting several orgasms to each of her partner’s one. Nevertheless, reported Davenport, “it is assumed that after a few years of marriage, the husband’s interest in his wife will begin to pale.” Until the recent imposition of colonial laws stopped the practice, these Melanesians avoided monotomy by allowing married men to have young lovers. Rather than being jealous of these concubines, wives regarded them as status symbols, and Davenport claimed that both men and women regarded the loss of this practice the worst result of contact with European culture. “Older men often comment today that without young women to excite them and without the variety once provided by changing concubines, they have become sexually inactive long before their time.”26
Closer to home, William Masters and Virginia Johnson reported that “loss of coital interest engendered by monotony in a sexual relationship is probably the most constant factor in the loss of an aging male’s interest in sexual performance with his partner.” They note that this loss of interest can frequently be reversed if the man has a younger lover—even if the lover is not as attractive or sexually skilled as the man’s wife. Kinsey concurred, writing, “There seems to be no question but that the human male would be promiscuous in his choice of sexual partners throughout the whole of his life if there were no social restrictions.” 7
We know that many female readers aren’t going to be happy reading this, and some will be enraged by it, but for most men, sexual monogamy leads inexorably to monotomy. It’s important to understand this process has nothing to do with the attractiveness of the man’s long-term partner or the depth and sincerity of his love for her. Indeed, quoting Symons, “A
man’s sexual desire for a woman to whom he is not married is
28
largely the result of her not being his wife.”
What to do about it? Most modern couples aren’t as flexible about tolerating a variety of sexual partners as the Melanesians and many of the societies we surveyed in earlier chapters. After reviewing the broad literature on Western marriage, sociologist Jessie Bernard argued in the early 1970s that increasing men’s opportunities for sexually novel partners was one of the most important social changes required in Western societies to promote marital happiness.29
But this hasn’t happened yet and seems even less likely now, almost four decades later. Maybe this is why some twenty million American marriages can be categorized as no-sex or low-sex due to theIn