B737-800 CAPT MAKES VISUAL APCH TO WRONG RWY AT CVG.

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WE WERE APCHING THE ARPT FROM THE E. I HAD GOTTEN THE ATIS AND ADVISED THE CAPT THE CURRENT WX AND THAT ILS RWY 18C WAS IN EFFECT. HIS RESPONSE WAS THAT WE WOULD DO THE VISUAL. THAT WAS THE EXTENT OF THE BRIEFING. AT AROUND 10 MI FROM THE ARPT; THE CAPT TOLD ME TO TELL THE CTLR THAT HE HAD THE ARPT. I RESPONDED BY ASKING THE CAPT IF HE HAD THE RWY. HE SAID NO; BUT HE HAS THE ARPT. I DID NOT HAVE THE RWY IN SIGHT NOR THE ARPT. I ADVISED THE APCH CTL THAT WE HAD THE ARPT AND WE WERE CLRED FOR THE VISUAL TO RWY 18C. WE HAD RWY 18C ILS TUNED IN BOTH NAV RADIOS. THE CAPT LINED UP ON A FINAL TO RWY 18L. I TOLD HIM THAT THIS APCH DIDN'T LOOK R AS THE LOC NEEDLE WAS SHOWING A FLY R INDICATION. HE CONTINUED UNTIL THE APCH CTLR CLRED US TO 5000 FT AND TURN TO A HDG OF 090 DEGS THE CAPT STARTED CLBING AND TURNED TO A HDG OF 270 DEGS. WE WERE THEN BROUGHT BACK AROUND FOR A VISUAL TO RWY 18C. WE WERE VECTORED TO LINE UP WITH RWY 18C BUT NOT GIVEN ANY LOWER UNTIL ABOUT A 3 OR 4 MI FINAL. THE CAPT ACCEPTED THE VISUAL AND DOVE FOR THE RWY. WE HAD RPTED FOR DUTY AT XA45Z ON APR/SUN/06 AND IT WAS NOW XF15Z ON THE APR/MON/06. THE FLT WAS A TAIL END CFR 91 FLT AFTER A DAY OF CFR PART 121 FLYING. THIS CAPT IS IN HIS LATE 50'S AND OUT OF SHAPE. THE EVEN BIGGER CAUSE OF THIS OCCURRENCE WAS THE FACT THAT THE FAA ALLOWS ACR'S TO SCHEDULE CREW FOR 16 HRS OF DUTY AND THEN ALLOWS THESE SAME CREWS TO FERRY AN ACFT CFR PART 91 AFTER THE 16 HRS OF DUTY. IF THE CREWS REFUSE THE FLT IN MOST CASES THEY WILL BE FIRED.