I have indeed considered (in the past) that my wife has faked orgasms. Everything I had ever heard or read prior to our marriage seemed to indicate that women rarely orgasmed from vaginal intercourse alone.
Early in our marriage, when I noticed how easily she orgasmed from intercourse, I raised the issue in the way of expressing amazement at how easily she orgasmed and contrasting it with what I'd read and heard. My wife said she didn't know why it was so easy for her; it just was. Perhaps, as you indicate, I'm just very lucky that her physical/mental "wiring" seems to make her climax easy.
For those following this thread, more good news: my wife and I ML last night after my parents (who were visiting for my wife's 32nd birthday, which is actually tomorrow) left after coming up for supper. More good news: SHE INITIATED. Most forcefully, in fact. I was grabbed and hauled (as much as a 120lb woman can haul a 235lb man) to the bedroom, where we spent nearly an hour.
If asked to speculate as to my wife's radical change in behavior in the past few weeks, I would venture to say that I have felt more able to speak to her about our problems because of the wisdom and encouragement I've received in these forums. Especially from people I've disagreed with elsewhere. It shows an impressive degree of maturity when past heated disagreements can be put aside: after all, we're here to help each other. Thanks everyone, and I'll keep you updated. Also, maybe I'll lurk around a few other threads and offer what help I can when I can.