Side B Christians are Christians who identify as LGBT or have LGBTQ+ experiences, but adhere to a non-affirming sexual ethic and thus commit to celibacy or a mixed-orientation marriage. The term Side B derives from an Internet forum where Side A Christians, with an affirming view of LGBT sexuality, were contrasted with Side B Christians. Prominent Side B Christians include Eve Tushnet, a lesbian Catholic based in Washington, DC, and Bekah Mason, executive director of Revoice. In particular, Side B Christians reject previous iterations of conversion therapy that falsely promise to change sexual orientation from the same sex to the opposite sex. Side B is also distinct from Side Y, which does not affirm LGBT identification.
The distinction between Side A and Side B first took place as part of the Gay Christian Network, founded by Justin Lee. Some make additional distinctions, including Side X, representing ex-gay Christians. In 2018, Revoice was launched as a conference for Christians predominantly identifying as Side B. Much of the movement of celibate LGBTQ Christians has its origins in the US evangelical movement.