Adult breast feeding
I totally disagree with your opinion and agree with Prabha.
Adult breast feeding is a kind of love that brings much closeness between couples ever before, due to the dependency on each other. Many more in this site and in the world are in this eternal relation which binned couples together.
Happiness and the love of effection cannot be explained, experienced by different people in different ways, one of this is mighty " Adult Breast Feeding" .
Regarding side effects, their would not be any side effects on either of them. In net you can find a lot of info on the same,no where its side effects are mentioned. In fact it helps ladies to get rid of Breast cancer during their ages, in modern day breast cancer has become higher. A question why in olden day their was no Breast cancer, why only in modern days?.
As you said that such relation is not allowed in this society, correct but how far its true. Its purely between the couples, their is no relation with the society regarding this. society is a place where public live together-modern way to say is civilization.
Please do not keep such beliefs in your mind and don´ t spoil your lovely nursing elation. I hope your married, please discuss the same with your partner and see the difference, you will understand the love, Good luck.