The female orgasm: Pelvic contractions

@article{Bohlen1982TheFO,
  title={The female orgasm: Pelvic contractions},
  author={Joseph G. Bohlen and James P. Held and Margaret Olwen Sanderson and A Ahlgren},
  journal={Archives of Sexual Behavior},
  year={1982},
  volume={11},
  pages={367-386}
}
Eleven nulliparous women manually self-stimulated to orgasm, each on three separate occasions. Pelvic contraction pressure was measured by an anal probe and a vaginal probe simultaneously. Near the perceived start of orgasm, a series of regular contractions began in nine of the women. Anal and vaginal contraction waveforms were synchronized with each other, and the same number of orgasmic contractions occurred in each lumen. Anal pressure had a higher resting baseline and greater amplitude… 
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