Most of us: provider & hobbyist alike, have our private lives and our "other life". Sometimes the 2 get mixed, but as a whole, we keep both separate and hidden from friends and family. However, I am fairly sure that with the "other" phone or email addy, there are contact names and numbers of those we have extra special relations. Text msg. if you don't know, can easily be retrieved by your cell phone provider.
So what would happen if you lost that other phone and someone who knows you only by your private life finds it and sees who is in your phonebook, finds your other email and sees what is going on. Something horrible happens to you and for whatever reason(s) all is revealed. OMG!