Research by Freeports Leisure, a UK clothes firm, has found that cup sizes in the UK have been going up steadily for the last three years. Some sizes have gone up by 36%.
The changes are attributed to lifestyle changes such as healthier nutrition and having children later in life. This helps keep their breasts fuller and pert longer.
Other theories are hormones in the water, cosmetic surgery and Darwin's Theory of natural selection. If men prefer big breasts then they pursue women who have them and they pass on their genes which include bigger breasts.