If we are talking about pornstars today. I would say about two or three percent I find really attractive and two or three percent I find alright and more mildly attractive. To be brutally honest, the other 94-95% just aren't that good looking. Porn has really gone downhill in that respect the last couple of years. Porn has always had some overrated or even ugly women in it, but I don't know why it has become in vogue for old over the hill, crack whorish, used up or tired looking, women that look about 40-50 (even if they are much younger) that you can tell are trying to hold themselves together with cosmetic surgery (unsuccessfully I might add) or just have had really bad plastic surgery, to show up in the numbers they have been or even have been as popular as they have been. Last years Freeones top 20 has a great many of people like that on it.
If we are talking about adult models then it's a lot better. I find about 25% of them really attractive, and about another 25% not that bad. Out of the rest about 25% are cute, but not attractive enough In my view that I think they should be making a career out of their beauty. About 25% of them don't interest me.