A preliminary report relating frequency of vaginal intercourse to heart rate variability, Valsalva ratio, blood pressure, and cohabitation status

The relationship between recalled frequency of penile-vaginal intercourse ( FSI) and resting heart rate variability (HRV; an index of parasympathetic t one), resting diastolic blood pressure (DBP) and heart rate (HR) response t o the Valsalva maneuver was examined in 51 healthy adults aged 20-47 (subje cts scoring above the 86th percentile on the Lie scale of the Eysenck Perso nality Inventory (EPI) were excluded). As hypothesized, greater HRV and low er DBP were both associated with greater FSI (but not masturbation or non-c oital sex with a partner) in cohabiting subjects, but not in non-cohabiting subjects. Valsalva ratio was unrelated to sexual behavior. Results are dis cussed in terms of both the modulating role of blood pressure on a number o f psychological functions and the role of parasympathetic tone in HRV, FSI, and possibly pair-bonding. (C) 2000 Published by Elsevier Science B.V. All rights reserved.