Actually underwired bras can be bad for your health. I suffered phlebothrombosis of the epigastric vein and the doctor/surgeon who diagnosed the problem asked if I always wore an underwired bra, which at the time I did. He told me the pressure of the wire had caused the problem. It was jolly painful I can tell you. I haven't worn wires since then.
Many a child has been spoiled because you can't spank a Grandma!