Nicola Davison visits one. It's a vivid reminder how uneven tolerance remains:

I'm at a fake-marriage market, where Chinese lesbians and gay men meet to find a potential husband or wife. In China, the pressure to form a heterosexual marriage is so acute that 80 percent of China's gay population marries straight people, according to sexologist Li Yinhe, a professor at the Chinese Academy of Social Sciences. To avoid such unions, six months ago, Shanghai's biggest gay Web site, inlemon.cn, started to hold marriage markets once a month.