Robin; I would think that the Digitrad Database would have some of those "bawdy" songs your Amigo is looking for. A couple of Sea-Chanteys of that genre' come to mind, and I think you will find them there or on previous postings via search;

Cruisin' 'Round Yarmouth

The Afterguard and the Topperman

Pretty Nancy of Yarmouth

One-Eyed-Reily (it's another typically paired anotomical feature what's missing in most versions I hear)

Since these are the type that were originally communicated by oral tradition from Shantyman to Shantyman etc. long before they were written or printed, I don't think anyone really knows their exact time of origin for sure.

Now Burke; here's a question for ye, and as clever as ye obviously are, now, I'll bet ye know it sure;

What is the significance of the notation typical to these early Hymns such as "7's and 8's" "L.M." (Which I think stands for "Long Measure"),"C.M." "S.M."(Common & Short Measure?), 11s, "7s., 4 or 8 lines" ("Prussia"), "7s.Double" etc.?
A Pastor friend once tried to explain this to me years ago, but I was unable to comprehend or remember much of it. I'm beginning to feel like a bit of an Idiot for not knowing this sort of thing, y'see.