Erect but not Aroused

I was hunting through my book collection last night, searching for suitable candidates for another exquisite corpse piece like The Big Afternoon Nap at the Vicarage. Nothing much turned up, except my copy of The Final Count by 'Sapper', where I came across a good illustration of how much English usage has changed over the past century:

... And then I took a pull at myself: I was jumping ahead with a vengeance... It seemed a perfectly ordinary erection, though considerably larger than I had thought when I saw it with the naked eye.