Very interesting, thank you! I've certainly got a few avenues to search down; unfortunately, as Hugill himself always said, the sailors didn't really do innuendo.
I would love to be able to get the smutty stuff into my repertoire without it being overtly rude; while things like The Fireship can be sung with a lot of smut and innuendo (but a child wouldn't know it was rude), most of the other stuff would seem to be pure filth or bowdlerized terribly. It's a shame there seems no happy medium, but if that's what they sang, we can't change history!