I've not visited saunas in Shenzen, but have had similar experiences with non English speaking mainland Chinese in HK (at Game Boy in Wan Chai - sadly no more!) One approached me in the communal showers, grabbed my dick and pointed at his arse (no translation needed). Another was waiting for me as I exited a toilet cubicle and simply pushed me back inside, dropped his towel and pointed at my mouth and his hard dick ( by now I think I am fluent in Chinese !) Hope to try Shenzen in November