1. The size should be just slightly bigger than a handful. Scientific studies have found that to be the perfect size for fondling, suckling, and will always retain the bouncy perkiness.
2. The areola should be between 1.61803398874989 and 3.141592653589793 inches. According to exhaustive research it is the perfect balance between youthfulness and sexual maturity.
3. The pitch and projection of the nipple should be about 0.4 inch which is slightly bigger than the average size of 0.38 inch. The extra .02 inches may not sound like much of a difference, but when placed in the mouth, it makes a whole world of difference.
Obviously one can not sum up the perfect boob so quickly as there are volumes and volumes of studies on the all important subject, but this should give you a good idea on what to look for in a perfect boob.