Yup, thanks for asking these questions cause I was pretty curious too. I love my boobs, but hope they don't get too much smaller. They didnt get bigger when I gained the weight, so I hope the opposite is true. Ive heard it really depends on the individual...
As for the other question, I pee a lot :) so yeah, we're all in the same boat...lol

I have what the doctors call "dense fibrous tissue" in my boobage, so they don't get bigger with weight gain and they don't get smaller with weight loss. Found another %#$@ lump this week, so I'm on that great road of being slowly hacked to pieces again. Wish the lumps weighed a little more so at the end of a week of misery getting it taken it out and biopsied I would have at least lost a pound from it!

What you learn in nursing school about question number two is "your boat should float." That indicates adequate fiber intake.

#2) I actually poop LESS despite eating 35-50 g. or fiber and drinking a ton of water daily.
#3) I have always had melons -- I am with Glory in that they have become oranges in tube socks now -- so much so that I can actually fold them in half and get a crease (like folding a heavy blanket). If I were still nursing, my little one could nurse from a backpack ON MY BACK!

I AM stunned by how light they are.