The macropenis dilemma refers to the mismatch between the average penis size and the most common ideal penis size in women. Surveys show that a woman's ideal erect penis size is 6.4 inches. This is despite the fact that the average erect penis size is 13.12 cm (1.66 SD; 5.16 inches). An erect penile length measuring 2 to 2.5 SD+ more than average is considered a macropenis. Hence, macropenis can be defined as a penis whose erect length is at least 17.27 cm.
This means that a woman's ideal penis size is actually only 1 centimeter away from the medical condition of macrophallism. In other words, women's ideal penis size is for men who are medically defined as being in the abnormal range, hence giving further credence to the Pareto principle.