I do think that some sensations (not all, sometimes pain is just pain!) can be perceived in different ways, depending on what your belief system is. I'm thinking, for instance, of the "ache" I sometimes feel when I'm becoming very sexually aroused -- under different circumstances I could totally see regarding that exact same sensation as unpleasant, but it's not, it's something I love. My undisturbed labors were a lot like that for me, and overall something that I really enjoyed. The real pain (i.e. something that you can't "interpret", it just is what it is) for me happened with my first birth which was overly managed/observed, and with my subsequent relatively undisturbed births when the baby's head hit my sacrum, which I very strongly suspect had to do with previous injury to my back/pelvis/hips. The baby moving through the birth canal spontaneously was incredible, one of the most awesome things I've ever felt.