It ceases to be pain and becomes more like a build up to an intense release. Some women decide they need preparation with LaMaze or Bradley classes. 1. to make it easier for themselves 2. to avoid pain. We are a society that likes to avoid conflict yet conflict helps shape our lives and opinions. The woman not only avoids the closeness of feeling birth but shooses to rely upon machines and other people to tell her what to feel.
Birth is a sexual act.
I believe that for some, it is the fear of feeling so close to a child. A friend told the story of watching a monitor to know when to push. She didn't feel the contractions. She relied on something to tell her when her body was creating contractions. She was disconnected from her labor and no longer in control or feeling anything.