You're on the right track, and it does have a female connection.
But, as you've mentioned a couple, then to be fair to others, I'll need the exact type, and name !
Come on chaps, Garry has virtually given it away, so at least have a (now informed) stab at the type, at least !
Clues :- It's American, got more than one engine, this one isn't in America, that's not a door panel, this one is airworthy, you've all seen the type many times, and it smokes heavily on start-up !
Ignore the probe / antenna - it may or may not be fitted to service aircraft, and Gary is hinting the right way - just no one has actually yet stated what they think the aircraft is !
Here I thought being American and smokes heavily, it was a GI on leave in Soho. Guess the bare metal, "Here I am, shoot me down" , was a give away for B19, B24, B25 or B29. Couldn't track down those strange triangular panel recesses.
At last, Gary has named the type, and it's nose art name !
It is indeed B-17G 'Sally B' at Duxford.
Those triangular panels are the very reason I cropped the pic the way I did - they're a dead giveaway for the latches on the hatch of the ball turret, and even cropped, I thought someone would have got it straightaway !
Here's the full image.