There's more selection pressure for strong secondary sexual characteristics--large breasts in women--than for penis size in men. Secondary sex characteristics in men are muscle tissue and hair.
It's apples and oranges comparing breasts with penises. They serve different purposes. Males don't need large penises as much as they need strong sperm and/or lots of it.
The breasts of almost all other mammals shrivel away to nothing outside of breastfeeding. Most of the tissue in human breasts is excess fat not mammary glands. For many women it's the first place they lose weight and the last place they gain it.
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