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How wide can a vagina open?

The human vagina is an elastic muscular canal, the length of an unaroused vagina is approximately 6 to 7.5cm (2.5 to 3 inches) across the anterior wall and 9cm (3.5 inches) long across the posterior wall. During sexual intercourse the vagina expands in both length and width, with arousal the vagina lengthens rapidly to an average of about 4 inches (10cm) but can continue to lengthen in response to pressure.
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