ANR stands for Adult Nursing Relationship.
From what I gather, some women are milkmaids and in the UK, they are doing a booming business.
The ages of the men who are seeking an ANR range from the early 20's to the senior citizens.
Some men nurse 4-6 times a day and I've read that once the milk comes in you can adjust the supply to the demand.
Breast pumps and maternity wear for women who aren't pregnant. Who knew?!
Here's some links, [NSFW] just to be on the safe side.