One of the reasons that many boxers don't work to the body is the fear of getting beaten to a pulp by exposing one's self to right hand counters and such. You cn get around this by working from the outside position, once you accept that there are body blows beyond the left hook to the liver area. This particular example seems odd at first but try it a time or two and you'll find that it works and, being rather old fashioned, is unexpected. To begin, your opponent leads with a straight left, parry to the outside position with your right hand. At the same time, drop your left arm til perpendicular with the floor and take a quick step with your left foot to a position outside (eg you'll step across) your opponent's left foot. As the weight shifts to the left leg whip your left up and in to the solar plxus. Continue through with the step- bring your right foot along- pivoting on your left foot back to your starting position. This leaves you in a good place to land a right or a left hook. Timing and a sharp quick twist of the hips can make this an effective punch and it is very difficult for him to counter you.