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Coolidge effect
From Wikipedia, the free encyclopedia
In biology and psychology, the term Coolidge effect describes a phenomenon—seen in nearly every species in which it has been tested—whereby males show continuously high sexual performance given the introduction of new receptive partners.[1][2]
Origin of the term
The term comes from an old joke, according to which U.S. President Calvin Coolidge and his wife allegedly visited a poultry farm. During the tour, Mrs. Coolidge inquired of the farmer how his farm managed to produce so many fertile eggs with such a small number of roosters. The farmer proudly explained that his roosters performed their duty dozens of times each day.
"Perhaps you could point that out to Mr. Coolidge," pointedly replied the First Lady.
The President, overhearing the remark, asked the farmer, "Does each rooster service the same hen each time?"
"No," replied the farmer, "there are many hens for each rooster."
"Perhaps you could point that out to Mrs. Coolidge," replied the President.
Empirical evidence
The original experiments with rats followed this protocol:[3] A male rat would be placed into an enclosed large box with four or five female rats in estrus. He would immediately begin mating with all of the female rats repeatedly until eventually exhausted. Although the females would continue nudging and licking him to continue, he would not respond. However, if a novel female were introduced to the box, he would become alert and find the ability to mate once again with the new female. This phenomenon is not limited to Rattus norvegicus.[4] It is attributed to an increase in dopamine levels and its subsequent effect upon the limbic system.[5]
Human males experience a post-ejaculatory refractory period after sex. They are incapable of engaging in sex with the same female after ejaculation and require time to recover full sexual function. In popular reference, the Coolidge effect is the well-documented phenomenon that the post-ejaculatory refractory period is reduced or eliminated if a separate female becomes available.[6] This effect is cited by evolutionary biologists as a reason why males are more likely to desire sex with a greater number and variety of partners than females.[6]
References
^ Reber, A. S. & Reber, E., The Penguin dictionary of psychology (3rd ed.), London: Penguin, ISBN 0140514511
^ Brown, R. E. (1974), "Sexual arousal, the Coolidge effect and dominance in the rat (Rattus norvegicus)", Animal Behaviour 22 (3): 634–637, doi:10.1016/S0003-3472(74)80009-6
^ Beach, F. A. & Jordan, L. (1956), "Sexual Exhaustion and Recovery in the Male Rat", Quarterly Journal of Experimental Psychology 8: 121–133
^ Wilson, J; Kuehn, R. & Beach, F. A. (1963), "Modifications in the Sexual Behavior of Male Rats Produced by Changing the Stimulus Female", Journal of Comparative and Physiological Psychology 56: 636–644
^ Fiorino, D. F.; Coury, A. & Phillips, A. G. (1997), "Dynamic Changes in Nucleus Accumbens Dopamine Efflux During the Coolidge Effect in Male Rats", Journal of Neuroscience 17 (12): 4849–4855
^ a b Hergenhahn, B. R.; Olson, Matthew H. (2003), An introduction to theories of personality, Upper Saddle River, N.J.: Prentice Hall, pp. 396–397, ISBN 0130992267
^ "Effect of novel and familiar mating partners on the duration of sexual receptivity in the female hamster", Behavioral Neural Biology 49 (3): 398–405, 1988, PMID 3408449
^ Pinel, John (2007), Biopsychology (6th ed.), Boston: Pearson Allyn and Bacon, ISBN 0205426514
^ Koene J. M. & Maat A. T. (6 November 2007) "Coolidge effect in pond snails: male motivation in a simultaneous hermaphrodite". BMC Evolutionary Biology 7: 212. doi:10.1186/1471-2148-7-212
^ Häderer I. K., Werminghausen J., Michiels N. K., Timmermeyer N. & Anthes N. (12 October 2009) "No effect of mate novelty on sexual motivation in the freshwater snail Biomphalaria glabrata". Frontiers in Zoology 66: 23. doi:10.1186/1742-9994-6-23.
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