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Abstract

Changing the Stimulus ♀ induced in ♂♂ of the poeciliid fish Poecilia sphenops a strong increase of copulation attempts, nipping and gonopodial swinging (“Coolidge effect”). There was a similar increase of sexual activities after social isolation of 23 hours and reintroducing the same ♀ like before. But in experiments it could be demonstrated that the effect of social deprivation can only partly be deduced from the Coolidge effect and seems to be also the result of sexual inactivity during the isolation period.