Yes Jen M, "Careless Love" fits rather well into the same family of songs. The tune is quite similar to the one I'm talking about too. Of course as I've mentioned I can sing other songs from the same family - including "Careless Love" without getting the sniggering. "Tavern in the Town" has them all singing along but there's no "nudge, nudge, wink, wink!" from them.
Conversely I have been known to sing "The Blacksmith" with it's very obvious naughtyness and had people tell me it was a beautiful song. Nary a laugh from them either.
In Australia if you sing, "Why was he born so beautiful? Why was he born at all?" it has the audience falling on the floor. Never knew why. Joy