Copulatory behavior can inhibit pregnancy in female rats.

@article{Adler1970CopulatoryBC,
  title={Copulatory behavior can inhibit pregnancy in female rats.},
  author={Norman T. Adler and Stephen R. Zoloth},
  journal={Science},
  year={1970},
  volume={168 3938},
  pages={
          1480-2
        }
}
If female rats received genital stimulation soon enough after their male partners had ejaculated, sperm transport and subsequent pregnancy were inhibited. Manual stimulation by the experimenter or five intromissions by a male rat were sufficient stimuli to reduce the number of sperm found in the uterus and to reduce the number of uterine implantation sites. 

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