name='Moor Larkin']What Batman said......... on my mischievous level
...............but what you said also occurred to me. Nowadays movie-makers would deem it implausible. I do wonder if, in fact, it was implausible at the time but the public mores of the cinema then merely allowed the viewer to "believe" it.
You could make it in reverse of course, where the ease of conducting a full-on affaire is made plainly available, but the protagonists elect to 'say no' because of all the damage it could wreak around them......... maybe that was part of the original ethos too.