Well, it sure won't help.
Guys look to see if you're wearing a ring, or have a line where one has been.
You will look like a married woman, or recently broken up, if there is anything on your ring finger.
On the other hand, that is a great way to ward them off if that's what you want to do.
It may be backwards in Europe - I know other places they wear the wedding ring on their right hand.
But in the US, if you want to keep the guys away, go ahead and wear any ring on your ring finger. The only ones you'll get are the cheaters.