I think that is correct.
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Sperm Plugs are something else used by certain snakes to plug a female's cloaca and it is thought to make the female unattractive to other males. This usually happens in mating aggregations such as Thamnophis sirtalis (sp) in Canada (example). They have all sort of pheromones, she/males, and other interesting mating strategies as well.
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The male of some snake species forms a copulatory plug which occludes the oviductal parts of the female's cloaca for a few days. The plug, apparently formed from secretions of the kidney immediately after insemination, probably prevents rival males from copulating with the same female.
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1. Following copulation, female Thamnophis radix are unattractive to sexually active males for at least 48 h; the stimulus basis for this change is the mating plug produced by secretion from the male's renal sex segment.
2. The mating plug inhibits the courtship behavior of other, unmated males.
3. The effect of mating and the mating plug on female sexual attractivity and receptivity serves to maximize a male's reproductive success by minimizing the probability of multiple inseminations.
4. Loss of attractivity and mating-associated behavioral changes protect the female from subsequent courtships and copulations, thus minimizing predation dangers.
5. Inhibition of other male's courtship behavior confers a reproductive advantage on the mating male; this odor may be the stimulus underlying unsuccessful male dispersal from mating balls.
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Female red-sided garter snakes, Thamnophis sirtalis parietalis, become unattractive to most males after mating in the field and in the laboratory. Male red-sided garter snakes vary in their latencies to court attractive females following copulation, with courtship resuming in minutes to hours. Unsuccessful males in mating balls disperse from mating pairs, but are not residually inhibited from courting attractive females. These patterns of behavior indicate that males have evolved mechanisms to maximize opportunities for copulation with several females, while females mate only once per season.
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Here is a link for interested parties
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and another
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Roberts Realm Of Reptile Research
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Thanks,
Frank Roberts

I opened my mouth and out flowed a melody black.