Superman inherited his x-ray vision from his family. He has Parental Super Vision.
I had a girlfriend once who was a X-Ray technician. But it didn't last. She could see right through me, and she couldn't see anything of interest.
My kid could get a bad X-ray and I could get a call from the doctor saying I have something growing in my bum and that would change my perspective on everything instantaneously, on what is and what is not important. Tom Hanks, actor.