Tykables, the only brick and mortar storefront in the United States dedicated to adult baby diaper lovers (ABDL), is located in Mount Prospect, a suburb of Chicago. Its customers, John-Michael Williams, the store’s owner says, include those ABDL who have a fetish or sexual interest in dressing like or pretending to be a baby; people who have a medical need for adult diapers and enjoy the brand’s options; and individuals, some of whom are on the autism spectrum, who find the diapers and child-style clothing provide a sense of comfort and stress relief. To be clear, those in the ABDL...