One way to encourage dilation at 38 weeks of pregnancy involves nipple stimulation to promote production of the hormone oxytocin, which helps induce contractions, explains Fit Pregnancy Magazine. Some women opt to have sexual intercourse to naturally induce labor because some research suggests that semen contains cervix-softening fats.
An orgasm during sexual intercourse may also cause women to have uterine contractions, which helps dilation progress. Spicy foods or a diluted glass of castor oil mixed with ice cream or orange juice may stimulate the bowels, release prostaglandin and promote the uterus to begin the process of labor. Castor oil can cause side effects such as dehydration, diarrhea and nausea, according to Fit Pregnancy Magazine.