Coolidge effect

Habituation to a mate can drive the search for novel mates (the Coolidge effect).

Applied to eating, the Coolidge effect explains not only the success of fad diets but also the increase in obesity over the past century.

The Coolidge effect is attributed to an increase in dopamine levels and the subsequent effect upon an animal's limbic system.

In 2009, Biomphalaria glabrata was a subject of the study focusing on the Coolidge effect in simultaneous hermaphrodites.

Coolidge effect - from a joke attributed to John Calvin Coolidge, Jr.

The Coolidge effect is the tendency of males of every tested mammalian species to perform at their sexual peak when introduced to a new receptive female.

In popular reference, the Coolidge effect is the well-documented phenomenon that the post-ejaculatory refractory period is reduced or eliminated if a novel female becomes available.

Even when a male is satiated after mating, it is able to copulate again when a new female is introduced (the Coolidge effect).

It is called "the Coolidge effect," after a famous (but perhaps apocryphal) anecdote about Calvin Coolidge.

Ethologist Frank A. Beach is credited with naming the "Coolidge effect" in 1955, after one of his students suggested the term at a psychology conference.

Such higher motivation to copulate when a new partner is encountered is known as the Coolidge effect and has been demonstrated in hermaphrodites firstly in 2007.

However, he was also known for his sense of fun, and humorously coined the term "Coolidge effect" based on an old joke about U.S. President Calvin Coolidge.

A 2007 study focusing on the Coolidge effect in simultaneously hermaphroditic species confirmed the validity of the Coolidge effect in freshwater snail Lymnaea stagnalis.

While the Coolidge effect is usually seen demonstrated by males-that is, males displaying renewed excitement with a novel female-Lester and Gorzalka developed a model to determine whether or not the Coolidge effect also occurs in females.

It is argued that effects like the Coolidge effect show that males do not seem to be naturally geared towards sexual mate guarding behavior of one female, which is evidence that sexual monogamy (though perhaps not social monogamy and/or pair bonding) was uncommon in early modern humans.