Another problem is women sleeping with their superiors in order to get ahead. Studies have put it at something like one in five, but that is based on self reporting. From experience and conversations with others, including women, it's higher. It can very disrupting, especially among the less attractive employees who feel it's unfair. Being less attractive they also tend to be outspoken and feminist which is why they are single. They also have no problem blowing up a company over this. You see this in new technology companies quite often. Uber is just the latest example.

So, on the whole it's fine hiring women if you're prepared to deal with the usual problems of women and all their issues.