Temporal relationships in the copulatory acts of adult male rats.

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Abstract
Analyses of time relations in copulatory acts by d1 rats were made by means of a high speed cinema camera. The duration of intromissions in non-ejaculatory copulations was from 1/3 to [image] secs. with a mean number of 5.6 pelvic strokes, while that of intromissions in ejaculatory copulations was 1-4 secs. with a mean number of 10.7 pelvic strokes. Profiles of sexual activity in 3-hour tests, while highly variable from rat to rat, are fairly consistent in the same animal if sufficient time is allowed for complete recovery between tests. Five points of similarity between profiles are cited in the text. "In this, as in previous studies, a relatively high degree of consistency is found for copulatory frequency in short tests. The data from short tests, however, have little or no predictive value for the results of the long tests." . . . "This finding implies that measures of sexual drive based on short sampling tests should have a very restricted meaning in studies of individual differences." [male][male] that are allowed unrestricted sexual activity during a 2-hr, period are relatively unaggressive and have few copulatory waves on the following night. Recovery time from satiation or near satiation appears much longer than that for thirst or hunger satiation. "This point is highly relevant in comparative studies of drives.".

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