The vagina is taking over the world of beauty products and skin care. One report predicts that the “feminine hygiene” market — which includes sanitary pads, tampons, panty liners and shields, internal cleansers, sprays, and disposable razors — will grow to $42.7 billion by 2022. As Dr. Kimberly Langdon, OB-GYN, medical advisor at Medzino, a digital health company based in California says, “It seems we’re...