First time round
10am Sweep, (on my due date)
9pm sex
9.30pm contractions started
4am baby born
OK that sounds really good doesn't it, actually it was 4am the next day 30 hours later, but am convinced that the combo of sweep and sex started it off.
Second time round
no sweep
sex in the evening,
started to dream I was contracting at some point, woke up and realised it was not a dream at about 3am, baby born 1pm a mere ten hours later,
So as for me I am convinced that it does something, but only if you are ready as I did do it regularly from 37 weeks first time round. (much too tired second time round due to elephantine size!)