The source that OP may be talking about is an OkCupid blog post that got scrubbed when they were bought out by Match. It was about rating the attractiveness of the opposite sex in heterosexual people, I think in Chicago in like 2008 among like 500 users.

The end result graph is here: https://www.google.com/imgres?q=okcupid+blog+20+of+females+a...

(sorry if that doesn't work)

The data is not nearly this simple as OP is stating, as to be expected with such topics. But the underlying idea is women don't mind that they think men are a bit ugly and will date them anyways. In that, women put less of a preference on physical appearances. Again, I've not read that blog post in a few years and I couldn't find the original source of it as Match scrubbed it. If anyone has the blog post, please let us know.

They're likely going to cite the OKCupid study, but leave out the part that the study applied to messages, not long-term partners. Polygamy may be on the rise, but not enough to account for the "multiple women per man" theory