I have DD's and rarely wear a bra. If you leak milk (I leak a lot), you can either cross your arms over your boobs and push in hard, or just press on your nipples when you feel the milk letting down at the wrong time. There are also a kind of "pad" called "lillypadz" that are made of silicone and stick to your boob without a bra. They are very cool. As for the sagging, mama boobs are going to sag no matter what, so you may as well be comfy.