The summer heat clung to my skin, the kind of sweltering day that begged for the relief of a cold shower. I was sprawled on the couch, half-dazed by the warmth, when Rae dropped the news that set my pulse racing. “Phill’s coming over to use our shower,” she said casually, tossing her hair as she headed to the bathroom. “Her place is still a mess from the renovations.” Phill, my sister-in-law, who was the quintessential go...

The summer night buzzed with possibility, the air charged with the kind of heat that made you crave something reckless. Rae and I had been toying with the idea of a threesome for months, her curiosity about another woman—or man—sparking a fire in both of us. We’d set up a profile on an adult swingers site, our photos showcasing our bodies—me, 27, lean and hungry; her, 23, all curves and mischief. The profile was clear: we...