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JoshuaZ comments on Rationality Lessons Learned from Irrational Adventures in Romance - Less Wrong
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This does not follow. There are many species where different members have evolved different mating strategies. For a really neat example see this lizard. Males have evolved three different strategies that are in a rock-paper-scissors relationship to each other.
It seems clear though, that your example is the exception and not the rule. There is no reason that evolution would have made lukeprog different from other males, given that he was human.
Actually, variable mating strategies are darn common for animals. Sometimes they represent stable lifepaths with whole species populations grouped not just by sex, but by which members of a given sex use which strategy (cleaner wrasses come to mind); other species vary thejr strategies based on things like food availability, or in different parts of their geographical range, or in different sub-populations.
I can give lots of other species that have stable equilibria with multiple mating strategies. There's also a fair number of game theory scenarios where the Nash equilibria involve similar mixed strategies. These aren't that uncommon in nature. The lizard example is just one of the weirder examples. This is clearly way too common for it to be labeled as "almost definitional".