In particular, sex can be used to encourage an overdue baby. The female orgasm involves contractions of the uterus which, if everything is ready to start anyway, can trigger off labour.
Some women are thought to be especially sensitive to prostagladins in the semen. Prostagladins cause the uterus to contract and semen has a higher proportion of them than any other body substance.
Experts reccommend that a position is chosen which will ensure that semen is deposited right up against the cervix (one suggestion is with the woman lying on her back with her legs raised against the man's hips, though it should be done gently.)
Breast stimluation can also produce a strongly contracting uterus, which may be a good thing - preparing the way for labour. Nipple stimulation can reactivate a labour that has stopped.
Strangely, doctors say that sometimes breast stimulation doesn't work. Perhaps it depends on how the nipple stimulation is done: breast pumps may be less effective than having a loved one slide his tongue over the nipples.
This information comes from "The New Pregnanacy and Childbirth", by Sheila Kitzinger, 1989. Who said that pregnancy had to be boring???
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