A photoplethysmograph, is a tampon-shaped device which measures vasocongestion (as an indicator of sexual stimulation) in units of vaginal pulse amplitude (VPA) that is how much blood is circulating each time the heart beats. The device also shines a tiny light and measures the amount of reflected light in the vagina as an indicator of vasocongestion (because vasocongestion alters the vaginal walls and the amount of light they reflect). To measure VPA the device is inserted into the vagina or anus during sexual stimulation.
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