Oh congratulations on your pregnancy. You must be utterly thrilled. Are they keeping an eye on you closely? Placental blood flow, should they be concerned, is something they can monitor daily if necessary.
The thing is with these 'myths' is that people who say they work often say well I did x and the next day I had a baby so it worked for me. Well in the 24hrs leading up to labour, people do a million things. You can't confidently assert any one thing, short of chemical induction, worked.Plus, at 40+ weeks pregnant, it's imminent anyway. Indeed all research shows that nothing at all works. Going into labour is an as yet not understood process and you can't influence it. It seems to be a communication between the baby and your body. It's nothing to do with pineapple, curry or sex.
willybreeder, it doesn't have truth in it. Yes there are prostaglandins in semen, just as there are prostaglandins used in the induction of labour. BUT not in enough quantity to do anything at all. Certainly, if you followed your logic through to the natural end, you need to apply that prostaglandin orally, just as they would in a chemical induction. In fact, they have carried out research where women took it orally to see if it did work better and actually there was an increased incidence of labour beginning but still only in a tiny minority and still not in any remarkable way which could show anything like cause and effect. Research really does suggest that nothing works and if a woman coincidentally goes into labour after doing any of these things, then she is just going into labour and making a link erroneously between the two. And at the very least, you need to go for a wee after sex anyway, not try and keep sperm in with your feet up. This is good advice for all women, but particularly pregnancy women. Weeing after sex prevents UTIs.
I suppose what pisses me off is that all of these old wives' tales are built upon things which make you uncomfortable. By all means march around, eat curry and have sex if you really want to but I see too many women feeling like they HAVE to end up with indigestion and have uncomfortable sex and then demoralised afterwards because it doesn't work after all. I am all for starting my own myths where chocolate and jaffa cakes and slumping on the sofa work for inducing labour. Women should be encouraged to enjoy the final days, relax, do whatever feels right and helps them feel comfortable even for a minute. Not chase after an impossible goal.