You sweat when you play sports or work out, so you wear water-wicking fabrics to help keep you dry? But what about physical activity that takes place in a more intimate area? That's what Sheex ($200-$220) are for. Made from a microfiber polyester/Lycra Spandex blend, these "performance" bed sheets are breathable to keep you from getting too hot, stretchy to help with nighttime tosses and turns, and able to wick water away from your body, keeping you dry whether you're having a good romp with your mate or just a gross, sweaty sleeper.