Where a woman feels safe and secure is where she will birth the easiest. If a woman likes water she may find herself wanting to be in water during her labor and maybe her birth as well. For many women their bodies guide them to immerse into water during labor. Warm, safe, more private, less possibility for unnecessary interventions, waterbirth may be an option to consider.
While a woman in labor relaxes in a warm pool, free from gravity's pull on her body, her body is less likely to secrete stress-related hormones. This allows her body to produce the pain-inhibitors, endorphins, which augment her energy for labor and birth, which, in turn may decrease labor discomfort.