An instrument that is used to assess physical changes in a woman's vagina as she experiences sexual arousal and is smaller than a tampon is called a vaginal .

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A photoplethysmograph is a medical instrument that is used to measure changes in blood flow in the vaginal walls as a means of testing sexual arousal in women. It is a small, tampon-sized device that can effectively measure these changes and track them over time. The other options listed are not typically used to assess sexual arousal or measure changes in the vagina during sexual activity.

An Instrument That Is Used to Assess Physical Changes in a Woman's