He was probably referring to this new study:
http://www.dailymail.co.uk/news/article-2129456/Do-girls-want-career-attract-man-Provocative-study-casts-high-fliers-new-light.html?ITO=1490
So apparently it's true.
In my experience, beautiful women are drawn to glamorous careers: book publishing, fashion, fashion magazines (everyone who used to work at Conde Nast was a six-foot, waiflike, gorgeous blonde), the recording industry, museums, art galleries and auction houses, interior design, etc. etc.
Maybe that's why DC isn't full of a lot of really gorgeous women?