"My life is not your porn," read one poster. "We should be able to live, not survive," declared another.
The women brandishing those signs in the center of Seoul, South Korea's capital, wore large sunglasses, baseball caps or broad-brimmed hats. The headgear and glasses serve partly to ward off the sun, but mainly to make the protesters unrecognizable to men who might be hostile to their cause: the fight against molka, videos that are filmed using cameras hidden in public toilets, school changing rooms or even women's homes, and then posted on the internet.
The cameras, disguised as clocks, pens or light bulbs, are bestsellers. Police register thousands of cases every year, but perpetrators are rarely caught and punished. The protesters believe that this is because officials do not take women's concerns seriously.
The women, who have turned out in the tens of thousands on several occasions since the spring and are planning their final protest of the year in late December, are the most visible part of a wave of activism against sexism in South Korea, where spycams in toilets are not the only problem vexing women.
Despite its material wealth, South Korea was ranked 118th out of 144 countries last year in the World Economic Forum's measure of equality between the sexes.
The average South Korean woman makes only two-thirds as much as the average man. Several cases have come to light recently in which companies deliberately and systematically discriminated against female job applicants, even though that is illegal. A group of male executives at KB Kookmin Bank, for instance, lowered women's scores and raised men's on a recruitment test to ensure more men were hired. The case wound up in court, but the executives received only suspended sentences; the bank was fined a mere $4,500.
Although young women are better educated on average than their male peers, many of them are pushed out of the workforce after having children, either for lack of good child care or because companies simply will not take them back.
In terms of appearance and behavior, women and men are held to wildly different standards. A news anchor caused a scandal earlier in the year when she chose to read the morning news wearing glasses, rather than contact lenses. Many firms, it subsequently emerged, had an informal ban on female employees wearing glasses. A YouTube star who used her makeup tutorial channel to announce that she was giving up makeup to join the "corset-free" movement, which challenges unrealistic beauty standards, received a torrent of online threats.