Yes the males have the long streamers. My fish has streamers that are about 1.5" long.
I think I posted this picture in another thread and you still can't see the streamers but it is a bit better picture. Someday I will master this picture taking stuff.
http://i43.photobucket.com/albums/e384/RuthCh/Naso.jpg

sorry about that. when i was looking up info on it i was on liveaquaria.com and they have a female and a male blonde naso. they depict the male as being a blue hue over the body and the female being grey. misinformation on my part

Well I just took a closer look at my fish and in fact the streamer are a good 6 inches long. Don't know where I came up with the first #?

either way like i said before he is gorgeous. now i know how to sex them. i picked up a half black mimic tang last night. the store exchange it for the naso i lost. the three tangs are doing really really good together. eating and everything. last night was entertaining watching the tomini and atlantic blue getting to know the mimic. no attacks but they do their flashing and fancy dancing. i actually laughed a few times