When friends told me about Britain’s first naturist spa hotel in Birmingham — Clover Spa, which opened in March — I couldn’t help but giggle as they expressed their horror at the very idea of holidaying naked. They pondered the discomfort of sunburned bits and shuddered at the thought of baring all for the world to see. Little did they know that I’d already been to a naturist spa, and loved it. I have always been insecure about my body. In fact, for the first year of our relationship,...