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Marla Ahlgrimm explains that underwear is meant to protect the vagina, specifically the vulva, from irritation while wearing clothing. Women who wear tight jeans, for example, can prevent chafing by wearing underwear with a cotton liner. In this capacity, panties are an invaluable asset to a woman’s wardrobe. But, are they always necessary? And what’s the best kind of underwear for a woman’s health?