Seeing a mother with a suckling baby IS a turn-on for a man because it evokes poignant emotions and a desire to be protective of the mother and baby.

That has been my experience and it is well within the realm of the evolutionary theory, meaning, the Darwinian approach - that the male's desire to protect the breastfeeding dyad is evoked by seeing them nurse serves an evolutionary purpose.

Remember that you are an animal of a special kind - a mammal. Mammals nurse their young.

Your opinion is way too cerebral.