From Art Thieme: Sounds to me, by those descriptions/noises/machinations, that one of them or both was/were having an orgasm!!

I don't think I want to visualize that...

Did you know that in the 17th century, "to die" was a euphenism for having an orgasm (among the living, that is)? As a noun, it was known as "the little death" -- presumably because for a moment or two, your senses tune out... If that's common in the language, not surprising there are romantic ghost songs. Doesn't mean that all those folks were into necrophilia, though... ;-)