The anatomy of this thread is remarkable, it started off as a question about a photo and then morphed into areas as divers as nasal hair, the size of a burger and then to a pair of chimps nuts.
Mind you, I can understand why that chimp is resting, of all the apes, ourselves included, the ratio of body mass to testicular size is most pronounced in the chimps, (I think chrispy is a close second) and gibbons have the smallest. And the size of the stones is directly proportional to the amount of shagging each spiecies must do. Gibbons only get a root every two years if they're lucky.
So that bloke really needs his rest judging from the size of that cluster.