Let's say you met an over-educated, underemployed, thirty-something man who seemed incapable of holding down a relationship, and who was known to date up to half-a-dozen women at a time after meeting them online. If you had to come up with a single theory to explain his desultory love life, what would it be? Dan Slater thinks you should blame the Internet. Of course, online dating has been around for a while now. But Slater doesn't offer up much hard evidence that monogamy is actually becoming passe in this country, other than to point out that divorce rates have increased -- an oversimplification of what's happened in the past few decades. Rather, he introduces us to Jacob, the pseudonymous thirty-something schlub I alluded to above.
Forget Online Dating: Here's Something That Might Really Hurt Monogamy
What is OPERATIONAL SEX RATIO? definition of OPERATIONAL SEX RATIO (Psychology Dictionary)
In the evolutionary biology of sexual reproduction , operational sex ratio OSR is the ratio of sexually competing males that are ready to mate to sexually competing females that are ready to mate,    or alternatively the local ratio of fertilizable females to sexually active males at any given time. The theory of OSR hypothesizes that the operational sex ratio affects the mating competition of males and females in a population. Usually variation in potential reproductive rates creates bias in the OSR and this in turn will affect the strength of selection. For example, a male-biased OSR means that there are more sexually competing males than sexually competing females.
9.4 Variety in Operational Sex Ratios
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The sex ratio is the ratio of males to females in a population. In most sexually reproducing species, the ratio tends to be This tendency is explained by Fisher's principle. Examples include parthenogenic species, periodically mating organisms such as aphids, some eusocial wasps such as Polistes fuscatus and Polistes exclamans , bees, ants, and termites. The human sex ratio is of particular interest to anthropologists and demographers.