An upper back tattoo design is a great choice for a man who doesn't want to flaunt his ink job ALL the time but still sexy enough to show off and attract the eyes of many women. Some sexy tribal design ideas to put here are simple tribal symbols positioned in the center of your upper back (something that represents a belief or characteristic of yours), a horizontal design that spans across the muscles on your upper back or even a vertical design between your shoulder blades. To make it even more engaging, follow the contour of your arm to add depth and flow. It is crucial that the tribal tattoo be proportioned to a man's bicep or it can look like a wreck. For instance, a small tat on a big arm can get lost in all the muscle while a big tat on a small arm can make him look puny and weak. Having nicely developed upper back muscles and nice skin always make these tattoos even more sexy.