An anonymous reader writes "We've discussed (at length) functional MRI technology as it pertains to marketing and virtual reality, but now Esquire writer A.J. Jacobs has become the first person to go inside the controversial machine to test the science behind his sex drive. As in, he has fMRI experts read his mind as to whether he's actually more turned on by his young wife or Angelina Jolie. The results, unsurprisingly, are both geeky and hilarious. Would you subject yourself to this kind of reality check?"