1. It makes you more attractive.
Well most men of nowadays are into women with a big behind also it is believe that men prefer women with fuller backsides because it enhances their appearance and that of the curvature of the spine.
A curved spine can relieve you of spinal pressure and other related injury during pregnancy, supports mobility to forage food for yourself until the baby arrives.
2. You can climb steps like a boss.
Walking on a staircase requires a combination of effort involving most muscles below the waist — including the biggest one (the gluteus maximus). That makes climbing steps a total bitch for anyone with a flat, weak backside (unless they have super strong legs).
3. Your backside can make pregnancy easier.
Proven. A fuller backsides can help you move easily during pregnancy by balancing the ever increasingly weight of your baby belly, which can put a strain on your spine.


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http://www.newsphases.com/2016/02/why-you-need-to-have-bigger-backside.html