I knew exactly what this meant before reading the article.
I had to pass through a similar screening at the courthouse every morning while I was on a jury. (Unlike airports you don't need to remove your shoes.)
Pro-tip: If you wear a belt, get one with a plastic buckle.
The full article is linked [1] and I can view it. See Fig. 1 and quoting the actual article:
"Specifically, 28.8% of adolescent men ages 14–17 were categorized in Class 2 (no sexual behaviors) in 2009 compared to 44.2% in 2018. Among adolescent women, 49.5% were categorized in Class 2 in 2009 compared to 74.0% in 2018."
For adults the percentage was much lower -- 3.8% rising to 3.9%.
[1] says Eisenhower grease was based on "English asbestos grease" which I assume is "Compound 219" [2]. Arnold J. Morway is credited as the Standard Oil researcher who developed Eisenhower grease. [3]
I was curious about the surfers as well. It's a reference to something John Rawls wrote in 1988:
"[...] those who surf all day off Malibu must find a way to support themselves and would not be entitled to public funds." [1] provides context.
In 1991, Philippe van Parijs wrote "Why surfers should be fed: The liberal case for an Unconditional Basic Income", which instead supports Rawls's surfers. [2]
"Yet since that term is under two years and as Lombard does not present a danger to society, he will not spend time behind bars under French court rules." [0]
https://news.ycombinator.com/item?id=29223815