There has been so much written about why guys are so reluctant to wear Speedos or similar swim briefs. Americans, and more and more Europeans seem obsessed with guys covering themselves from navel to knee with board "shorts" - note the advised use of the word shorts!
Australians still seem happy with briefs - it was the Australians that started the Speedo company.
Look no further than all these posts of happy Aussies showing off their BudgySmuggler briefs worldwide and posting their pics on Facebook and tumblr.
What other nationalities still love briefs - I suspect the far east nations, China, Japan, SE Asia?
http://budgysmuggler.tumblr.com
https://www.facebook.com/BudgySmuggler