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A woman's vagina is an elastic 'potential room' that can accommodate almost any penis size. Despite what many people think, a vagina is not just a 'hole' in the body. The length of an unaroused vagina varies, but is normally 6-7.5 cm across the anterior wall (front), and 9 cm long across the posterior wall. When aroused, it expands in both length and width. The vagina extends from the cervix to the vulva. On the anterior wall, some 3-5 cm from the vulva, is an erogenous zone also known as the g-spot. For some women, stimulation of this spot during sex is particularly pleasurable.