My dd2 isn't breastfed any more, she's almost 18 months
I took advantage of what was probably a nursing strike to stop when she was about 13ish months as she only fed at night anyway and I was wrecked
She still likes my breasts though, when she comes up for a cuddle she likes to stroke them
Should I be concerned? No? Didn't think so.
Breasts aren't sexual unless their owner wants them to be.
Strident? No, not at all. When someone does something, anything, that is percieved by most of society as being outside of the norm then it's only natural that they would want to seek out other people who do the same thing - whether it be extended breastfeeding, knitting, trainspotting, whatever.
Wouldn't life be dull if we were all the same? Doesn't mean that anyone is right or wrong, just a case of different ways of getting through life.