Who had sex to help induce labor?

No experience with it here, but I heard from a midwife that the only scientifically proven way to physically induce contractions is nipple stimulation. Apparently, that releases the most oxytocin and can give that extra push to get things going.
As a massage therapist, I also often recommend firmly massaging the Achilles tendons (especially the inner side of the leg) once there's some rumbling and some early contractions.

It did help for me, at 41 weeks and 2 days haha. But you can always give it a try!

With me, my labours started like this. Not that I consciously did anything to induce contractions, but it just happened that way. With both my pregnancies. I had sex and felt a cramp in my stomach right after. And then my contractions started right away. She was born 2 weeks earlier than her due date. And it was exactly the same with my second pregnancy. Everything was fine, I felt great, no discomfort, no cramps or pain, nothing. Until I had sex, and right after that I started feeling cramps, my contractions began, and she was born. So yes, for me it's proven that it can happen. Greetings, Madelene

Nope... your body only responds when you're ready for it...
If you're already having a lot of contractions or hardening of the belly, I'd skip it.

Well, that's exactly what happened with my princesses. After intercourse, I felt cramps, the contractions started, and they were born 2 weeks before my due date.
Greetings, Madelene