So if you want to assess who’s really a Christian and who’s not—and lots of people do—you need a proxy, some externally measurable quality that is deemed representative of the person’s internal commitment. Among single people in the church, one of the most popular proxies is sex. The celibacy represented by a purity ringV—real or metaphorical—identifies evangelicals as one of “us.” This may never be spoken, but as a girl in the subculture, I can assure you, it is felt.

