Having recently been part of an interview panel, we interviewed 18 very good candidates to fill a pretty well paid (>£40k) position following a retirement.
Of the 18, 7 were women between the ages of 25 and 35 none of whom had children.
Because it was a fairly well paid job involving developing relationships with clients, we chose not to consider any of the 7 purely because we didn't want to run the risk of them getting pregnant, taking a year off, having to employ a temp and running the risk of clients leaving due to a lack of continuity.
This is, of course, completely sexist and illegal, but the greater good of the company outweighs this.