Based on Wikipedia's definition, a "bishounen" is:
Quote
... a young man whose beauty (and sexual appeal) transcends the boundary of gender or sexual orientation.
Yeah. THAT.
But he doesn't have to be young, necessarily, just exquisitely beautiful.
... So, yeah.
Got milk?
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EDITED TO ADD:
What follows is a masterlist of THE best ultra-bishounens in shounen/seinen manga. Please continue to recommend bishies even if they don't meet this level of insanely seductive androgynous beauty, but only the cream of the crop from among your recommendations will be listed here.
Behold, The Ultra-Bishie Masterlist!
Yama Fu-Tang - BISHIEST BISHIE EVER, 5 STARS *****!
Tsumikabatsu
Mizuho Ambivalent
Kuroshitsuji
Vampire Hunter D
Hinata no Ookami
Mononoke
Taimashin
More will be added as you recommend titles, or as I discover them!
Last edited by tartufo at 5:38 am, Feb 19 2010