And the subject is one which is nasty intrinsically, and doubly so because the terminology is wiggly and ill-defined, and triply so because the entire thing is a subject that you're Just Not Suppposed To Talk About (especially if you're a male or, in our culture, a female who doesn't carry pink triangles and rainbows around), and quadruply or quintuply so because it's something that everyone - everyone - has strong feelings about.
So I've been sort of dreading posting anything, since even if I do somehow write a marvelous glittering piece of prose explaining my point in unambiguous, crystal-clear terms, shining in the sunlight and faintly humming with contentment, there's inevitably going to be someone who reads "Open Source Boob Project", notices that my avatar is male, and goes to flame me about how, given the fact that I mention the concept, and that I'm a male, I must clearly be a rapist.
Or possibly Hitler. Not that the two are necessarily exclusive.
Luckily, I no longer have to, because someone did it for me. So go read that, and I'm serious, because it's a damn good read.