Wedding Rings
In my opinion, they are overlooked as a tool that's able to be incorporated into sexual play. In mainstream society, wedding rings are of course meant to symbolize the promise of a married couple to be faithful to each other. They indicate that the wearer is a 'taken' woman, and has no interest in men other than her husband. So when I see a ring on a finger of a woman I'm either flirting with or having sex with, I view it as a turn-on and a taboo to be broken.