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The Red Queen's Hypothesis, also referred to as Red Queen, Red Queen's race or Red Queen Effect, is an evolutionary hypothesis. The term is taken from the Red Queen's race in Lewis Carroll's Through the Looking-Glass. The Red Queen said, “It takes all the running you can do, to keep in the same place.” The Red Queen Principle can be stated thus:

In reference to an evolutionary system, continuing adaptation is needed in order for a species to maintain its relative fitness amongst the systems being co-evolved with.

The hypothesis is intended to explain two different phenomena: the advantage of sexual reproduction at the level of individuals, and the constant evolutionary arms race between competing species. In the first (microevolutionary) version, by making every individual an experiment when mixing mother's and father's genes, sexual reproduction may allow a species to evolve quickly just to hold onto the ecological niche that it already occupies in the ecosystem. In the second (macroevolutionary) version, the probability of extinction for groups (usually families) of organisms is hypothesized to be constant within the group and random among groups. Its counterpart is the Court Jester Hypothesis, which proposes that macroevolution is driven mostly by abiotic events and forces.

You see? That's why you need to have sex with me.
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Here's a relevant quote from Gregory Bateson's 1970 paper Ecology and Flexibility in Urban Civilization

«...the distribution of flexibility among the many variables of a system is a matter of very great importance.
The healthy system ... may be compared to an acrobat on a high wire. To maintain the ongoing truth of his basic premise (“I am on the wire”), he must be free to move from one position of instability to another, i.e., certain variables such as the position of his arms and the rate of movement of his arms must have great flexibility, which he uses to maintain the stability of other more fundamental and general characteristics. If his arms are fixed or paralyzed (isolated from communication), he must fall.»

Bateson pointed out elsewhere that sex probably evolved as a type-checking mechanism - to make sure that the new offspring are likely to be more or less as viable as the parents, with only minimal variations - i.e. sex acts not to speed up evolution, but rather as a brake on diversification, even though the offspring will necessarily differ from both parents.
I don't need to have sex with you ... I have with my husband.
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