In a study conducted in 2013, researchers conducted an experiment to test if the Coolidge effect could be observed in female rats. In their experiment, they assigned female rats to one of two conditions: paced or non-paced. In the paced condition, females were able to control the timing of copulation, while in the non-paced condition males regulated the timing of mating. Females in the paced condition were placed into an arena that was divided into two compartments which contained holes that only the female could pass through. The female was placed on one side of the divided arena, and the male was placed in the opposite side; this allowed the female to enter and exit the male's side depending on the circumstances, therefore regulating the timing of copulation. In the non-paced condition, both the female and male rats were placed in an undivided arena and were allowed to mate. In both conditions, females were exposed to a constant, familiar male followed by a novel male. Their results found that females showed a significant increase in proceptive behaviours when a novel mate was present, but only if the female could regulate mating. Repeated mating with the same male also resulted in a decrease in proceptivity, which is thought to suggest sexual satiety. These results suggest that the Coolidge effect may also be present in female rats.