Porn stars aren't particularly keen on being studied. But they are the focus of great public interest and moral debate, which may explain why one man's in-depth analysis of adult film performers went viral last week. The average adult film actress is a brunette with a B-cup named Nikki, at least according to blogger Jon Millward, who spent six months analyzing the demographics of 10, porn stars drawn from the Internet Adult Film Database. But what's known about porn stars beyond their breast size? Remarkably little, thanks to practically zero research funding and a community wary of researchers. Not only that, Kross said, but many actresses are reluctant to help researchers, because they're worried that the studies will be used against them by anti-pornography activists. This lack of research is notable given the number of stereotypes about porn actresses, particularly that they have high rates of childhood sexual abuse and psychological problems.