It wasn't that long ago when Gwyneth Paltrow raved about the benefits of vaginal steaming, a non-scientifically proven process of sitting over a hot pot of water filled with herbs for up to 45 minutes to “cleanse your uterus” and “balance female hormone levels,” as the actress had put it. Most recently, Paltrow's lifestyle website Goop, which promoted vaginal steaming, is at it again with another advice for women: putting a jade egg — yes, a solid object about the size of a golf ball — in your vagina, and keeping it there all day or while you're sleeping. For...