Breast sag naturally due to increase in size of glandular and lobular tissues, as well as tissues containing fat and water.
It is a natural phenomenon.Imagine carrying a bag of water in your hand, there's a tendency for that bag of water to drag your hands down.
How much more when we consider the constituents of breast which sometimes can even include milk and we think it will not make it fall.
It's the same way the pair of testes inside the scrotum contains seminal fluid, seminiferous tubules and as a result of what it contains, it sags downwards in the region it is situated behind the penis.
It sags because there is something inside.
No matter how the scrotum is cuddled, dragged and used, it will not sag more than it's supposed to sag neither will it stand more than it should because of what is inside it.
In the same vain, the standing or falling of breasts has everything to do with it's content and the weight and fullness thereof and has nothing to do with if the woman has been promiscuous or if she has allowed different men to play with her breasts or squeeze and suckle.
That is why as a man, if you ever find yourself commenting, squeezing face, judging or opening your mouth to misyarn about a woman's breast which is fallen or falling or fell as the case may be, hold your scrotum and shout "God I'm very sorry for badmouthing what you created. I will have sense next time Dear Lord"
As for you that woman, just know that all breasts that stand today will fall tomorrow, as such use that breast and breast feed your babies today. Don't mind anybody iyeh.