ok, I hope this makes sense.
Get/download one of those anatomical illustrations of the cutaway of a female body. It usually is colored in flesh tones showing all the guts and bones and whatnot. Change the color pallet to standard map colors and add long and latitude lines. The crotch area could be labled as Sea of Dispair or something like that. The heart could be labled as Lake Placid... you get the idea. A penis shaped peninsula could be added near the bottom and labled Isle of Wood...
( i know I have spelling errors )
I'm not sure what made me think of this. Maybe it was the giant wanker at the bottom of your illustration
I'm gonna try this idea on my side whenever I get a spare freak'n moment. I'll post it here if I actually do it...