In this presentation to the Royal Society of Medicine, Katharine talks about the importance of the father during the childbirth process.
(Part 2)
Katharine continues to talk about the muscles of the Uterus and Cervix releasing, how is it that a muscle can go to two sets of muscles in the body, and one works, while the other lets go? Its similar to the arm, when there muscles of the biceps work, the triceps release, it is natural for pairs of muscles in the body to work together.
It appears that the muscles in the Uterus a re malfunctioning because you have pain.
and then