Getting a guy to take dance lessons is like giving a cat a bath. Most men don't like to dance because they do not know how, and don't want to make a fool of themselves. I believe that many people say they don't like things or activities that they haven't even tried. My mom used to say how can you say you don't like a certain food if you have never tasted it? So the key is to be supportive of your man and to make it fun.
Start off with a fun mini private lesson in which its a light lesson not trying to learn so much at one time.
Pick a dance that fits the kind of music that he likes. When he sees how it is a skill you both can learn together they will have a great time.
Its a sport and is very creative for you both.