That being said, I've seen it with males as well, but it has been more of the one guy on the team gets his MBA/college buddy hired kind of thing. In both cases, employees would be rightfully skeptical because of outside influences in the hiring/promotion process that are trying to purposefully achieve some end goal.
My wife, who formerly worked as a software dev, hated this aspect of the industry because there were so many women-in-tech groups that were trying to help (a.k.a. coddle) her achieve something she could easily achieve on her own by her own technical acumen. In similar vain, I've gotten jobs because of who I know more than what I know before (in my case it was because I'm a submarine vet and the hiring manager was also a former submariner), and yeah, it does undermine the sense of accomplishment that comes with doing something on your own.