When you send a book out to an agent, you have to write a query letter. This letter tells a little about the book and predicts its audience. In my query I had to explain why there was a need for my book and books like mine.
My answer was 'Because couples with small children are divorcing at an alarming rate.' It could be because the husband is having an affair. It could be because the young mother is too exhausted, too angry and resentful to go on.
The bottom line is this: in most cases the husband has too much free time on his hands while the wife has no free time.
My book shows that it is easier to level the playing field than to get a divorce.