The Anti-Cheating ring, despite its hefty $550 price tag, is a pretty hilarious idea that some dudes could probably benefit from wearing. As the photos show, it leaves a mark on your finger that says "Married." The humorous description says it all:

With Arnold, Tiger and two timing IMF guy in mind, we have created this wedding ring for people intent on cheating. The negative engraving on the inside means that when you are in the ‘Club’ and an attractive woman…or man comes along to chat, slipping your wedding ring off is not an option. The mark left on your skin says…’I’m Married’

Material: Made of strengthened Titanium. Life time guarantee, ‘til death and all that.