“The hook on "Only Girl (In the World)" is the unimpeachable, fist-pumping part of this Loud standout, but it's also the point where Rihanna gets vulnerable-- and gets real. A crucial, humane complement to the man-eater verses and the overt, "make it last all night" sexuality of the bridge, the hook requests, no, demands her emotional needs be fulfilled. Producer Stargate's relatively minimalist ap”