Article: Oral contraceptive use and female genital arousal: methodological considerations.

The use of the vaginal photoplethysmograph (VPP) over the past three decades has enriched our understanding of the factors that influence and are implicated in female sexual arousal. Its development allowed for many of the observations made by Masters and Johnson (1966) with respect to physiological sexual excitement to be quantified objectively. The VPP consists of a clear, acrylic, tampon-shaped probe that is inserted vaginally. A light-emitting diode projects a beam of infrared light that illuminates the capillary beds of the engorging vaginal tissue. Embedded in the probe is a photosensitive light detector, which detects the amount of backscattered light reflected from ...

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