Because it's not the one I'm posting with, it's the nekkid one behind the cut tag, hidden to preserve the livelihoods of everyone who reads from work.
Also, 4 days to connexions! Eeeeeeeeeeee!
Edit: No, I have no idea what it's from; someone posted it on fanforum in a rapidly digressing thread that went from "Let's talk about Spike without calling for his execution, please" to "BtVS characters: boxers or briefs?" Clearly, Giles (in his avatar as whoever he's playing here -- possibly James from Manchild but I can't tell) favors option 3.
- Silliest GIP ever.