IMHO, calling this juvenile shows a lack of education in the fine art of the limerick. In particular, the bucket/nantucket limerick format, which is well over 75 years old. According to Nantucket.net, papers like the "Princeton Tiger", "Chicago Tribune", "New York Exchange" and "Pawtucket Times" started it off, and it ran from there.
The cruder version seen in this thread, too, apparently dates from the book Immortalia, published in Philadelphia in 1927!
Perhaps it is juvenile. But in that case, so are most of our other great literary bawds, shakespeare not the least of them (check out the first few lines of R&J, for example).
Stuff changes from being porn to being an "important historical document" if you give it enough years.
-- This isn't my real sig. I tried to do that, but I just got biro marks on the screen.