Catty, we are hoping for a homebirth, if I can make it to 37 weeks, so I don't really want to risk anything that is going to bring it on too early, besides I think 35 weeks is still a little bit too early, even for a hospital birth.
Typical, if I was absolutely set on having sex purely to induce the labour it would never work, but if we had sex now and hoped for the best, I bet it would start it all off!
Thanks everyone, it looks like we will just have to wait