Right.
None of it works.
It's all, quite frankly, bollocks.
If curry, sex, raspberry leaf tea, long walks, pineapple, orgasm. If any of these things worked to induce labour, we'd be told to avoid them all until we reached 37 weeks. Have you been told to avoid curry or pineapple during pregnancy?
Thought not.
If they worked, then there would have been no need for the invention of syntocinon or prostaglandin pessaries, and going in to hospital for induction would be unheard of.
Raspberry Leaf Tea tones the uterus, making contractions more efficient but doesn't induce labour.
You'd need to eat something like 7 pineapples a day for weeks for it to have any effect.
Sex - in semen there is prostaglandin which is what pessaries used for induction contain. However it is in very concentrated amounts in the pessary, and in order for you to get the same amount from sex, you'd need a lot of sex. I get extra annoyed when women say they don't really want sex, or their partner doesn't, but they do it anyway to try and get the baby out. NICE guidelines say that sex shouldn't be suggested as a method of induction.
NICE clinical guidelines say that nipple stimulation may work, but there needs to be more research. If you are going to do it, you need to do it for a long time, and frequently. It's no good having a quick twiddle twice a week when Mr Bloom's on TV and thinking that'll do.
Don't bother doing any of this stuff. Labour begins when a hormonal exchange takes place between you and your lovely baby. Instead of wearing yourself out or making yourself miserable or thinking you have to do something, try the old fashioned sitting on the sofa eating Jaffa Cakes (or any other biscuit/cake/treat) because you're going to need all the energy you can muster to get through labour when it starts.
Oh, and normal pregnancy is between 37 and 42 weeks, so no-one is actually 'overdue' until they get past 42 weeks :)