Why does portly tend to stockpile surrounded by the breast nouns?

Why does portly tend to stockpile surrounded by the breast nouns?
Because breasts are meant to hold fat.
Men don't own breasts. We have chests.
Women hold soft fatty breasts.
Mmmmm... This question make me thirsty for milk.
Hormones. Estrogen is responsible for increased fat load. This is why women carry more tubby than men, more specifically in their breasts and hips.
Estrogen. I'm sure you've hear the relation between steroids and men getting large breasts. Your body would fetch more estrogen while doing something like that (males).