By hiring only women as a policy. People overlook it, and a lot of parents don't want their children changed by a man. Plus, insurance companies mysteriously raise rates when men are on staff. My college friend started a daycare for his church and encountered all this fun, and I had to deal with some of these issues when we were running daycares (excuse me, Early Childhood Education centers) in the 90's.

I would imagine after rejection after rejection men would find something else (insurance was my friends out). It still amazes me how many industries insurance companies seem to influence the hiring in.