Vaginal pulse amplitude response patterns during erotic conditions and sleep

Area of Science:

• Psychology
• Physiology
• Women's Health

Background:

• Vaginal photoplethysmography is used to measure sexual arousal, but subject selection has lacked standardization.
• Previous studies on sexual arousal response patterns in women have used small, non-standardized samples.

Purpose of the Study:

• To compare physiological sexual arousal (vaginal pulse amplitude - VPA) between women with high and low self-reported sexual arousal.
• To investigate VPA during waking erotic conditions and sleep.
• To explore discrepancies between self-reported arousal and physiological/subjective laboratory measures.

Main Methods:

• Two groups of women were selected based on percentile ranks from the Sexual Arousal Inventory.
• Vaginal pulse amplitude (VPA) was measured during waking erotic stimuli and sleep.
• Subjective arousal ratings were collected during laboratory conditions.

Main Results:

• No significant differences in VPA were found between high and low self-reported arousal groups during waking or sleep.
• Subjective laboratory arousal ratings did not differ between the groups.
• VPA increased significantly from baseline to erotic conditions and varied across sleep stages, peaking during REM sleep.

Conclusions:

• Self-reported low sexual arousability does not correlate with a lack of physiological response.
• Retrospective self-report measures of sexual arousability differ from laboratory-based subjective and physiological measures.
• Future research needs improved laboratory conditions or validation of physiological measures in naturalistic settings.
• Nocturnal VPA monitoring shows potential for assessing sexual dysfunction with possible organic causes.