i understand what your saying mate, but my personal phone never leaves me, any way i delete all texts each day from my personal phone, so if left around there's nothing in it for anyone to see!
but as to your point, about ticking time bomb, if im not mistaken, i think i read a review of a punter who used hes own personal phone to see a regular escort that he see's, and when she came back to ireland she texted him to say she was back in town, and on that day his wife had the phone as hers was broke and she red the text, and he lost everything as he got caught!
so if you have a wife or gf, its a "must" that you have a 2nd phone or sim and just lock it away some were!