Coolidge effect
nounEtymology First used in a 1955 publication by behavioral endocrinologist Frank A. Beach, to whom it was suggested by a student, in reference to a joke about US president Calvin Coolidge and sexual promiscuity.
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Biology, Human sciences, Natural sciences, Psychology, Sciences A phenomenon in animal species whereby males (and to a lesser extent females) exhibit renewed sexual interest if introduced to new receptive sexual partners, even after cessation of sex with prior but still available sexual partners.