worked for me! and within about 4 hours too! but it was only a few days before my due date.
was told a funny story while waiting for DS2 to arrive, the midwife told me she was talking to an indian couple about wanting to try to bring on labour. whatever is in sperm is what they make the gel out of that is used to induce labour (which is why it works), so she told the couple to go home and have sex, only has to be a "quickie". they got sent home and came back a week later only to say it wasn't working, so she said just keep doing it. the man started to complain to his wife and the midife asked if everything was ok. the man replied "this is getting really expensive" and of course the midwife asked why, and he said, "condoms are so expensive and we are going through heaps of them".... PMSL. apparently he didn't want to infect the baby with his sperm.
but yes i does work, well it should work, but if your still not "ready" it wont happen straight away.