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Pressure changes in the vagina and uterus occurring during human coitus were measured by a radio-pill a pressure-sensitive device useful in radiotelemetry. In the vagina pressure was negative during intromission and male orgasm but was positive during female orgasm. In the uterus pressure changes were minimal during male orgasm but changes markedly increased during female orgasm attaining a positive pressure of 40 cm of H2O; a sharp fall after female orgasm was measured resulting in a negative pressure of 26 cm H2O. These findings seem important in sperm transport. It is suggested that the final negative pressure in the uterus after female orgasm effects an insuck of cervical mucus and trapped sperm aiding reproduction.

MEASUREMENT OF INTRA-VAGINAL AND INTRA-UTERINE PRESSURES DURING HUMAN COITUS BY RADIO-TELEMETRY