Someone wise once told me that "as far as women are concerned, boobs only come in two sizes, too big or to small" . Please relax, you are all beautifull.

Down to the numbers, I used to work at a clothing retailer, looking after databases, I ran a size analysis on the bra sales in the UK, B cup is definitely the UK average, C is next, but there are as many A's as there are D's

As for what men think, actually most of the time bigger is not always better, its all about proportion and shape, not overall size, extra large might get noticed, but its not always desired.

Also I think its the hips/waist shape that really defines a shape as feminine, not the chest per say, something I try, unsuccessfully, to achieve.

My boobs come in cardboard boxes BTW, I can vary the size, but I fully understand just how heavy and inconvenient large ones are, so I usually stick with a B unless its special occasion.