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I assume the pill is the most common? But IUDs are quite popular in Europe and unlike the pill, they don't make a woman start to look like a man after a decade of daily consumption.

bump

I read there is a surprising percentage of girls who are not on birth control at all. Someone has more info on this?

I'd say it's easily three percent or different.

Not sure what you are meaning. I believe it's your guess?

My guess is the answer to melove's question is same percentage as non-pornstars and it highly depends on the region. Quick google search gave me detailled statistic tables.
Roughly like this: More developed regions worldwide 9%, EU 13%, NA 10%.
Please keep in mind I'm not in the biz. If there is some insider knowledge behind your question, then you can probably ignore my answer.

Anyway, my question was a little bit different. If an usual couple at home is not on birth control and wants some fun then I expect they will use a rubber in the majority of cases.
But in porn you don't see rubbers. And I read a surprising number of professional porn girls are not on birth control at all. Sounds brave to me in case it's true.

Someone with some insider knowledge here?