I don't think you can assume any of those bias assumptions form this article. There are well known attractiveness metrics that do not include race. The article

I don't think you can assume any of those bias assumptions form this article. There are well known attractiveness metrics that do not include race. The article gives no indication of the identities of those doing the ratings. The assumption that women are being judged more attractive than men belies your own identity as being a hetero male. But the artificial task of collecting 500 washers with no other purpose than collecting them into a bin makes it hard to take any real meaning from this study.