Man caves are nothing more than escapes from our realities. There not sexiest unhealthy, there just an escape. (They can be unhealthy if he is spending all is waking hours in them, away from the family)
I am starting to believe especially as i age, that most men live, quite lives of depression. Maybe the whole idea of the man cave was for us to escape everything. (our own lives mental health issues)
We all need a break from the day, our own place just some moments to ourselves. A she cave is a great idea.