Want a man, or a worm?
Among mammals, expecting monogamy tends to run against the grain of nature.
By David P. Barash
LA Times
March 12, 2008
As an evolutionary biologist, I look at New York Gov. Eliot Spitzer's now-public sexual indiscretions and feel justified in saying, "I told you so."
One of the most startling discoveries of the last 15 years has been the extent of sexual infidelity (scientists call it "extra-pair copulations" or EPCs) among animals long thought to be monogamous. It's clear that social monogamy -- physical association and child rearing between a male and a female -- and sexual monogamy are very different things. The former is common; the latter is rare.
At one point in the movie "Heartburn," Nora Ephron's barely fictionalized account of her marriage to reporter Carl Bernstein, the heroine tearfully tells her father about her husband's infidelities, only to be advised, "You want monogamy? Marry a swan." Yet thanks to DNA evidence, we know now that even those famously loyal swans aren't sexually monogamous.
One species that is, and, significantly, perhaps the only one that could be reliably designated as such, is Diplozöon paradoxum, a parasitic worm that inhabits the intestines of fish. Among these animals, male and female pair up while adolescents; their bodies literally fuse together, whereupon they remain sexually faithful until death does not them part.
(Continued here.)
By David P. Barash
LA Times
March 12, 2008
As an evolutionary biologist, I look at New York Gov. Eliot Spitzer's now-public sexual indiscretions and feel justified in saying, "I told you so."
One of the most startling discoveries of the last 15 years has been the extent of sexual infidelity (scientists call it "extra-pair copulations" or EPCs) among animals long thought to be monogamous. It's clear that social monogamy -- physical association and child rearing between a male and a female -- and sexual monogamy are very different things. The former is common; the latter is rare.
At one point in the movie "Heartburn," Nora Ephron's barely fictionalized account of her marriage to reporter Carl Bernstein, the heroine tearfully tells her father about her husband's infidelities, only to be advised, "You want monogamy? Marry a swan." Yet thanks to DNA evidence, we know now that even those famously loyal swans aren't sexually monogamous.
One species that is, and, significantly, perhaps the only one that could be reliably designated as such, is Diplozöon paradoxum, a parasitic worm that inhabits the intestines of fish. Among these animals, male and female pair up while adolescents; their bodies literally fuse together, whereupon they remain sexually faithful until death does not them part.
(Continued here.)
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