Copulation and ejaculation in male rats under sexual satiety and the Coolidge effect

Physiology & Behavior
José L Tlachi-LópezRosa Angélica Lucio

Abstract

Sexually satiated males cease copulating after several ejaculations with the same female; and the presence of an unknown receptive female renews copulation including ejaculation, a process named the Coolidge effect. It is believed that the Coolidge effect has the aim to impregnate another female, although it is known that the sperm count gradually decreases after consecutive ejaculations. The main goal was to investigate if sexually satiated males during the Coolidge effect can reestablish seminal expulsion associated to the ejaculation behavior and/or penile erection associated to the intromission behavior. The results show that during the Coolidge effect, most of the sexually satiated males showed the motor ejaculatory behavior, however, no sperm in the uterine horns or seminal plug in the vagina were detected. Such lack of sperm was not related with the number of ejaculations required to achieve sexual satiety nor with the number of intromissions needed for ejaculating (experiment 1: 2.4.1.). After the behavioral ejaculation, during the Coolidge effect, there was a 44% decrease in sperm count in the epididymal caudae (experiment 1: 2.4.2.). Males that mated for 8 behavioral ejaculations (close to sexual satiety) deposited ti...Continue Reading

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Citations

Sep 1, 2015·Physiology & Behavior·Jorge Rojas-Hernández, Jorge Juárez
Jan 9, 2013·Physiology & Behavior·Rosa Angélica LucioAnders Ågmo
Jun 11, 2020·Proceedings. Biological Sciences·Alexandra M MutwillNorbert Sachser
Feb 3, 2021·Social Neuroscience·Oscar E Prospero-GarciaMónica Mendez-Díaz

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