I don't know if you will like my response . . .
I HATE pushing! I can deal with labor no problem, but I find pushing to be horrible. I pushed for 3 hours with ds1, and 1.5 hours with ds2. Each time I wanted to give up, and thought that there was no way I aws going to be able to do it.
With ds2, I remember telling my midwives that it wasn't going to work, that I was going to split open. They reassured me that I wasn't, but I was positive I was going to be the first woman in history to split in half when the head crowned!
Is it like a big bowel movement? Yes, "big" being an understatement. It feels to me like pushing a bowling ball out of my butt!
Like some others have mentioned, it is completely uncontrollable. I describle it like the dry heaves but coming out the other end. I had to bear down, I had no choice. And remember, you do have breaks in between. With ds2, I had long breaks in between, probably 3-4 minutes, which really helps to keep your energy level up.
And even though I had a natural birth with my first, being in the hospital, the pushing was way more managed than I would have liked, and I think contributed to it taking 3 hours.
My 2nd was a home waterbirth, and my midwives basically said nothing about when or how to push. I told them when I was pushing - I could feel it coming. The tail end of my contractions starting 'feeling pushy' and I knew it was time. Even though I still really hated the whole sensation, it was so much better to just go with my body more than I did in the hospital.