In the event of a water landing, his bulge will function as a flotation device.
It's difficult to tell what year this photo was taken. I'm guessing somewhere between 1957 and 2035. That's because I know 2035 is the last year that men are allowed to wear clothes.
And yes, this swimming getup is hotter than a standard issue speedo. After all, stimulating the imagination is super important because the brain is the biggest sex organ. Make that the second biggest!