It's not what you think, boys. And, ladies, why don't you join the fun right now?

The latest viral trend on Instagram has a lot of women everywhere ditching their bras and having photos taken of their bare naked torsos.

The trending sensation called "The Topless Tour" shows thousands of photos of women raising their hands in joy amid some of the most famous and easily recognizable landmarks in the world. There are also photos of topless men but topless men are, well, just topless men.

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You can see the hundreds of pictures at http://instagram.com/the_topless_tour.

Sorry, guys. Most of these daring ladies have their backs to the cameras.  

The photos are pleasantly non-erotic, but somewhat revealing nonetheless. But the tour is exploding. It's got over 9,000 Instagram followers and 5,700 Facebook likes

The Topless Tour isn't new; it began last year. Perhaps the reason why it was slow to catch on is because it does demand some nerve for a girl to take her top off and pose for the internet.

 There aren't that many Asian ladies on the tour, though. But you'll soon change that, won't you.

I dare you.