yeah I know you did not ask!
Okay, this one is a little off-color.
For some reason I began to think of the word junk as being used as an euphemism for the male genitalia. A brief search on the Internet describes the origin of this use of the word as murky. First use in print with this context was in gay literature. To me, it seems a little counter-intuitive to use the word, junk, this way. Most guys that I know strive to keep their “junk” very well polished, one way or another, not something you typically do with junk. (Insert your own comedic rim shot here.)
Just for grins and giggles, if you are interested here are a couple links of the multitude of articles on the subject.
Origins of ‘junk’ as slang are murky
Even the New York Times weighed in: On Language:Junk