That's why I said I don't completely agree. Danny doesn't really break out of the expectations of his gender role, just takes up different aspects of it. Sandy, however, by being more outwardly sexual is breaking out of the expectations of a 50's feminine gender role.

It was by no means the focus of the movie, and if anything, Rizzo was the most defiant of her expectations, which is probably why the line is buried so far into the article. It didn't even register it until I doubled back.