Sexual desires are a part of every human being. How this desire is aroused depends entirely on an individual. However, you can say by the way of society or nature, men tend to express this desire a bit more boldly. The fact that it is easy to spike their senses is not hidden and they can get turned on by various gestures or instances not just by touch.
However, getting back to answering the question, there are few sensitive/erogenous zones that arouse the erotic desires in men. To name a few:
Hope this could be of some help to get your man turned on and enjoy some intimate time with him!