According to a 2015 , the average penis length is 5.16 inches. If your penis falls short of that benchmark, then you are statistically on the smaller-than-average side. For most people, it's not a dealbreaker. In fact, studies have shown that in the first place. To quote the old adage, it's not the size of the wave, but the motion of the ocean that matters. And if you know the best sex positions for guys with a small penis, you'll be in really good shape.