Question for Russian expats in Shenzhen

Hello,

I have a quick question for Russian expats in Shenzhen. I heard a rumor that Shenzhen makes it hard for non-married Russian women to get a 5 day visa into Shenzhen. The rumor sounds absurd to me, but I wanted to know if there is any truth to it. I am asking this because I am traveling with my Russian girlfriend to Shenzhen from Hong Kong. So I ask this question to the Russian community here, have you ever heard of any such quarrels for non-married Russian women traveling to Shenzhen? Thank you for your responses. All the best.