This is definitely true for attractive females employed in Japan's myriad sex businesses. We don't have a decent rail system where I am so it's most noticeable

This is definitely true for attractive females employed in Japan's myriad sex businesses. We don't have a decent rail system where I am so it's most noticeable in the airport: you constantly see women in facemasks, wearing baggy velour jumpsuits that don't <i>completely</i> conceal their physique. High probability they are gravure models who came to shoot a beach/tropical video, or they worked in the sex clubs for a bit. The facemask definitely helps maintain anonymity when they are out in public and don't want to be accosted by creepy fans.