![]() ![]() The females continued nudging and licking him, yet he did not respond. He immediately began to mate with all the female rats repeatedly until he eventually became exhausted. The original experiments with rats applied the following protocol: A male rat was placed into an enclosed large box with four or five female rats in heat. The joke appears in a 1972 book ( Aggression in Man and Animals, by Roger N. President, a different hen every time." President: "Tell that to Mrs. Coolidge said, "Tell that to the President when he comes by." Upon being told, the President asked, "Same hen every time?" The reply was, "Oh, no, Mr. She asked the attendant how often that happened and was told, "Dozens of times each day." Mrs. ![]() When came to the chicken yard she noticed that a rooster was mating very frequently. Coolidge were being shown around an experimental government farm. He attributed the neologism to Īn old joke about Calvin Coolidge when he was President. Beach claims in a 1974 letter to have introduced the term "Coolidge effect" in either 1958 or 1959. Origin of the term īehavioral endocrinologist Frank A. The Coolidge effect has been demonstrated to occur in humans across cultures and in both sexes. ![]() This type of mating system can be referred to as polygyny, where one male has multiple female mates, but each female mates with only one or a few males. The male may be reinvigorated repeatedly for successful insemination of multiple females. The evolutionary benefit to this phenomenon is that a male can fertilize multiple females. The Coolidge effect can be attributed to an increase in sexual responsiveness, and a shortening of the sexual refractory period. To a lesser extent, the effect is also seen among females with regard to their mates. The Coolidge effect is a biological phenomenon seen in animals, whereby males exhibit renewed sexual interest whenever a new female is introduced, even after sex with prior but still available sexual partners. ![]()
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