> But I also had one boss who did not want to hire one woman because " what happens when she gets pregnant"

This is perhaps an example where extending parental leave benefits to both parents solves both ends of the problem. Men also may leave if they choose to expand their family, and women aren't pressured into more child care than they prefer due to the men not having parental leave to help.

> They are in avg more social

Careful with these generalizations. Women get placed in impossible behavioral expectations. Told to be more assertive, but then perceived differently than men when they are.