Sometimes Stan kept the rhymes and sometimes he didn't. Sometimes the rhyming words were not the bawdy parts. Sometimes he left out "objectionable" stanzas altogether, and sometimes he didn't bother to mention this. It seems likely too that some songs, like "Christopher Columbo," were so intractable that he simply suppressed them.

As for "reconstructing" based solely on what's printed in Stan's books, one person's "obvious" reconstructions are not always so "obvious" to others. My impression is that most of the "real words" are probably cruder and less amusing than folkies would like to think.

The only satisfactory solution, of course, would be the appearance of Stan's manuscript. Sociologists and social anthropologists would rejoice.