According to this study, having sex at the end of your pregnancy with some frequency will reduce the need for being induced for postdates pregnancy at week 41.
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Peng Chiong Tan, Anggeriana Andi, Noor Azmi, M. N. Noraihan Effect of Coitus at Term on Length of Gestation, Induction of Labor, and Mode of Delivery Obstet. Gynecol., Jul 2006; 108: 134 - 140.
