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

► During the Coolidge effect males show behavioral intromission and ejaculation. ► During the Coolidge effect males do not expel semen. ► During the Coolidge effect males dislodge prior seminal plugs. ► The sexually satiated male is a potential copulating rival to other males. ► The sexually satiated male loses the ability to fertilize, but not to re-mate.