While I personally agree that 6 is too old, it is not sexual abuse. Read the law. There is NO sexual gratification for the mother in the act of nursing. As a matter of a fact it can become down right annoying at times!!! There is no sexual gratification. Let me say that again, there is NO sexual gratification. Breastfeeding is NOT ABOUT SEX. It is about nutrition and comfort. Very very few mothers nurse beyond infancy (clinically defined as 1 year), and even fewer past toddlerhood. Those dedicated enough to let the child decide when to wean have my admiration, as it is not an easy choice for many to even nurse at all.
According to much of the research I have done the average age of a child who is allowed to wean on his own is somewhere between 2 1/2 and 3 1/2 depending on the child. Most toddlers who nurse only nurse at bedtime and nap time. Most breastfeeding experts will tell you that a baby's need to suck (and it is a need) varies per child and in some can continue through preschool. How many toddlers have you seen with pacifier? How many kindergartner's suck their thumbs? It is an extention of that need. As a parent it is my job to meet my child's needs.
As for the teeth comment, most babies get most of their teeth by around 8 months, the American Academy of Pediatrics recommends breastfeeding to AT LEAST one year and how ever long after that mom and baby wish. If the govening body of the nations doctors for children agree that mothers should breastfeed even after their child gets teeth, I don't think either you or I have the education and knowledge to disagree with them.
Wishing you enough...
N~