Interesting. So what aspect of birth specifically arouses you? Presumably, certain birth videos are more arousing for you than others - what is it in those particular videos that you find arousing? For example, do you like painful births, painless births, something in between, or does pain not matter to you?
I have no interest in pain except the way it helps to build on the idea that the birth is more difficult and intense. So its strong contractions, straining and pushing and the vagina starting to present evidence the baby is moving down right through to crowning. I tend to prefer early crowning more than later crowning and delivery is less arousing than that.
Another strange thing,,, whenever i watch one of the good birth video's i will often 'finish' even before seeing anything.... just the labor. Yet any birth video that i know does not show the actual birth at some point, is of no interest too me at all. Even birth video's that 'briefly' show a bit of birth (of which there are plenty - the damn teasers) are of no interest too me. So it is enough for me just to 'know' the birth can either be properly seen or not properly seen at some point for me to be totally turned on or not turned on at all.
I will often get turned on by just the labor of a new birth video i have not seen before, but once i have finished watching it and there is no good footage of the actual birth, then i have no further interest in the video and i delete it immediately.
Oh, there are some very rare exceptions.... there were a series of Filipino homebirths released on YouTube by Mrlovebirth3 (no longer available on his page) that do not show the actual birth bit they turn me on like crazy all the same. It is the idea of a small Asian woman with a tiny tight pussy trying to give birth that adds that extra edge i like.
I found a few re-bloged here and there, (links below) this is my favorite, There is no clear shots of the birth at all, but i would rate this as pretty much my number one favorite birth ever;
https://www.youtube.com/watch?v=kTL5dhQz770
https://www.youtube.com/watch?v=EIPCKq-m8S4
https://www.youtube.com/watch?v=niQ1njgiWr4
https://www.youtube.com/watch?v=xz9vcT05GoQ
https://www.youtube.com/watch?v=ztJaOBlAXBY