It is the most powerful, overwhelming feeling. To me, it felt like a human being I have grown coming down through my pelvis and out of my vagina. Both times, I could feel all the tissues stretching, their flesh grinding against mine, their heads squeezing through the birth canal on their way out to the world. I did some form of hypno-birthing both times.
I was a bit out of it with my firstborn (diamorphine) and he was a big baby - I remember how massive he felt against the inside of my cervix and vagina - like he was never going to fit. Pushing him took some effort and I was forced to birth on my back. Second degree tear that healed fine with some stitches I hardly felt. I was on the biggest high and we all went home for lunch after having the baby at 1am the same morning.
The second time round, my labour was amazing. I was with it the entire time and I could feel my child turning as they descended down my pelvis just before I had to push, kicking back against my flesh for added speed. I could literally feel them corkscrew their way down - it was so intense. The baby pretty much shot out as it was smaller than my previous one, and I birthed on my knees, leaning against DH. First degree tear, a few stitches, job done.
I had a shower immediately after delivery both times and they were the best showers.
If it was not for the fact I am certainly not up to bringing up three kids, I would love to give birth again. Even if I never got my orgasmic birth, my labours still felt amazing.