I usually take one on each arm, and a Timex quartz for any swimming/sauna in my bag.
I've had no problems in Copenhagen with a PT Yacht Master, and no problems in Lithuania with a PAM036 and a MBW TT Silver Serti dial (the clubber's choice ), although when I took them off for customs on the way back home to England, I got a funny look. One guy was looking at the movement of the PAM036 with curiosity.
Anyway, off to Stockholm on 13th Oct, so I'll see how that goes, don't expect any problems, just have to figure out which watches to take and how many.