Warning: this is not for the faint of heart. And it goes without saying (but I'll say it anyway), that it's the epitome of NSFW — unless you work here. OK, now that that's out of the way, read on, if you dare. Gird your loins for 40 of the most outrageously sexy GIFs of all time. And yes, Charlie Hunnam's bare bum will make an appearance (or two). They get progressively sexier, so let's begin with the sexual tension . . .