Rats having different types of previous sexual history were given an experimental sex experience in which they copulated to one ejaculation or until sexually satiated; then they received a preference test for the odors from the original vs. a novel sex partner. Polygamous males preferred the novel female odor (p < .05) at both levels of satiation. Monogamous males showed no preference at either level. Vigorous males mating for the first time preferred the novel female odor (p < .01) only if satiated. Polygamous females showed no preference at either level of satiation for the odor from the original vs. a novel male. Beach and Jordan (1956) showed that pairs of rats allowed to mate ad lib gradually become less responsive and finally, ceased copulating after the males achieve an average of about seven ejaculations (range: 5-10). However, under these conditions, the termination of mating behavior is thought to stem not from the physical or sexual exhaustion of either partner, but rather from a reduction in the excitatory value of the female (Beach, 1965, p. 554; Fowler, 1965, pp. 74-75). Support for this view is supplied by Fisher (1962) who showed that under optimal conditions of stimulus variation, males will achieve an average of 12 ejaculations (range: 7-22), and by Krames (1969) who showed that females will continue mating with a second partner until the latter achieves an average of 5 additional ejaculations (range: 3-6). Other investigators have also shown that satiated males are more likely to resume copulating with a novel female than with their original partner

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