It really depends on what you are looking for in romance and what you reason for going to this country would be. I lived in Italy for 3 years and traveled to France often. Maybe because I was there everyday, neither seemed so romantic to me. But I am an outdoors kinda person so romantic for me could be camping in the Pocono Mountains in the fall, seeing all the colorful trees and a warm fire to cuddle by at night. Or someplace warm like Tahiti with a great beach where you could lay and sip a beer or some exotic drink.
Edit: I was considering Mexico. My fiance and I might go to aculpoco sometime.
Interesting question. Most people probably equate romance with France (Paris) or Italy.
But for me, I would have to say Greece. The Greek islands are magnificent. The scenery spectacular. Ancient history and wonderful food just adds to the ambiance.