Ah, the male ego strikes again: "There are very simple ways-- without an MRI machine, to tell if a woman is faking an O or not."
If you truly believe this, you are simply wrong and the confidence with which most men believe this is a big part of the problem. I know of no aspect of an orgasm that women cannot fake convincingly, except, perhaps female ejaculation. Of course, I understand that some women fake this by peeing a little, but urine is of course detectable.
I do think it is excellent that you apparently acknowledge the possiblity of faking during sex and make it clear that it is not necessary. That will make women appreciate you, even if they still go on to fake occassionally.
