Bikinis are so sexy because they so barely cover anything. They leave so little to the imagination that it's tempting to simply pull the fabric aside and reveal what they were barely covering to begin with. As any woman knows, a bikini is not bought to hide anything, but rather to show off and flaunt what you've got. Wearing one, especially on vacation, makes you want to turn to your partner and give him a good look of what everyone else was trying to imagine. It's even better when crowds of tourists are nearby, but you feel like you're getting away with something naughty.