Yes of course breast milk is kosher, but I thought it is meant for the child, no ?

I actually thought there was something according to which if a person (man or woman, adult or child) drinks the breast milk of a woman, that person becomes a child of that woman. I think same applies to Islam. I may be wrong, maybe it's just some traditional belief in some countries.

Anyway, would any guy here be comfortable drinking his wife's milk ???