In case anyone thinks Melissa and I were silly for mentioning sex and nipple stim for induction check out...
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Sex
Making love can be one of the last things on a woman's mind toward the end of her pregnancy. She feels clumsy and big and may be experiencing a lot of vaginal pressure. But believe it or not, sex is one of the things you can do to get your labor under way. When you and your partner make love, his semen (which contains prostaglandins) can stimulate contractions.
Nipple stimulation
Some women massage their nipples as a way to induce labor. This stimulation brings about the release of oxytocin, which is the natural form of pitocin. Oxytocin causes contractions, which sometimes evolve into labor.