Volatile fatty acids, “copulins”, in human vaginal secretions

@article{Michael1975VolatileFA,
  title={Volatile fatty acids, “copulins”, in human vaginal secretions},
  author={Richard P. Michael and Robert W. Bonsall and Michael S. Kutner},
  journal={Psychoneuroendocrinology},
  year={1975},
  volume={1},
  pages={153-163}
}
Abstract (1) In a double-blind study using a new tampon method, 682 samples of vaginal secretions were collected from 50 healthy young women attending a university. (2) Samples were analyzed by gas chromatography for the volatile fatty acids (C2-C6) that have sex-attractant properties in infra-human primates. (3) All subjects produced some acids but acetic predominated; however, 30% of women provided samples containing more than 10 μg of other acids in addition to acetic, and these women formed… 
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TLDR
Women on oral contraceptives had lower amounts of volatile acids and did not show any rhythmic changes in acid content during the menstrual cycle, suggesting these same substances possess sex-attractant properties in other primate species.
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