My take on your question "how is it possible to love what is not perfect" (meaning the human body - I imagine), I don't believe it is possible. We are conditioned from infancy on what the perfect body is supposed to look like. We are conditioned to believe that we are not good enough if our partner is not someone that fits society's depiction of beautiful. We lose standing within our family, our friends and even our jobs if we are not courting a beautiful person. Ergo, we all strive to fix whatever defects we have so that we might conform to the ideal image. To make ourselves worthy of being loved and accepted.

When we get older we are taught that we should look within and place importance on "inner beauty" or personality but it is just too late. The idea is sweet but humans are frail (as you suggest) and the conditioning of physical beauty is just too strong.

I hope I am wrong here but this is how I see the world. I don't say this to offend anyone as I am far from perfect myself. I don't fit the mold and have given up trying. I don't think we can overcome society's teachings.