With the exception of having a young daughter (although she is still an infant), I would!
In our house a closed door means do not disturb With teenagers I doubt I'd use it and to be honest if it's not the kids wanting to walk in I don't much care if I am inflagrante with one guy and the other shows up. LOL
If I had my own place, I'd have it on my door all the time, just to look at. But around here with my grandma and occasionally kids walking around, I wouldn't.