The co-habitation rate around must be sky-high. A girl in my office got married recently and peple are finding out slowly. The general reaction is a surprised look and a shrug. The attitude seems to be summed up in this quote by one girl today:

哎呀，现在人结不结婚没什么事吧！

Aw come on, these days it doesn't really matter if people are married or not!