Sometimes (for me most of the time) the search function here on the forum doesn't work so well. I've had better results manually looking in the archives (there's enough info there that you could read for a week and still not read everything) or doing a google search such as "sexing Bluegill pond boss".
This is a link to the archive thread about sexing BG. Is this what you were looking for?
http://forums.pondboss.com/ubbthreads.php?ubb=showflat&Number=258505#Post258505 As for reliably sexing LMB, unless you use a catheter during spawning, it ain't gonna happen. At least not as reliably as I'd want to for any pond where I specifically wanted single sex LMB in it.