Sex to induce labor?

Have any of you guys tried sex to induce labor? Today (11/20) is my due date and so we decided to have sex to see if we could jumpstart anything. At my last appointment on Tuesday I was 1cm and 60% effaced. We had sex about an hour ago and I'm having a few BH and some back pain. So I guess my question is, have any of you tried sex to induce labor and if so, did it work and how long before you went into labor?