I've just watched GMTV and they were explaining this in a bit more detail, its not "orgasmic' as such, just pleasurable.
The orgasmic title is from America, which says a lot
When I gave birth to my youngest, I was determined to do things my way, I had had an awful experience with my first. With my second, I had no pain relief or intervention at all. The midwife was brilliant and left me to my own devices for pretty much the whole time.
I enjoyed giving birth to my 2nd. It was pleasurable and I can honestly say it was brilliant. I have only fond memories of that day.
I don't know if it has any connection but, the relationship with my youngest son has always been brilliant. We are very close and still spend lots of time together ( off to see Metallica with him tonight!) He is nearly 17 btw. As a baby, he was very laid back and easy to be around. He has always been an easy-going kind of person.
Not orgasmic birth, but definately an experience I would of loved to repeat.