OMG!!! Rihanna wore out an X-Rated t-shirt recently

How can Rihanna wear a t-shirt like that out? From afar, it doesn't look scandalous, but then you zoom in and you're like WTH?? See an up-close pic after the cut. Unbelievable! 18+ please
See a closer pic after cut:

That's a Freaknic t-shirt and according to MediaTakeOut, it was festival that took place in Atlanta back in the 1990s, where people used to have orgies. Photo credit: MediaTakeOut.