And how to bring them back. In a recent New York Times article titled, “Men, Where Have You Gone? Please Come Back,” Rachel Drucker laments what she calls “a collective shift” in men, a “slow vanishing of presence.” So many single men, she writes, aren’t “sitting across from someone on a Saturday night, trying to connect.” Instead, they “have retreated from intimacy, hiding behind firewalls, filters and curated personas, dabbling and scrolling.” She adds, “We miss you.”Ms. Drucker – a single, 54-year-old Chicagoan – hints that pornography is at least partly to blame for this state of affairs. She mentions...