National Review Online | The End of Sex: "“Eggs are expensive, sperm are cheap.” That’s a plain-English approximation of Bateman’s principle, which holds that in a species with two sexes, the members of the sex that invests less biologically in reproduction will end up competing, sometimes ferociously, over the members of the sex that invests more. Because healthy men can in theory reproduce almost without limit while women are constrained by the number of pregnancies that they can take to term in a lifetime, women have a very strong incentive to be more selective about their sexual partners, while men don’t: snipers vs. shotguns, basically."
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