Are manga/anime twin boys always queer?

I've only seen twin boys in two mangas:
-Ouran Host Club (Hikaru & Karou)
-Vampire Knight (Ichriu & Zero)
WHY is this? Does Japanese culture think that twin boys are gay or something?
Or is this natural in Japan?
Or do the twins just really, really love each other?
HELPP!!!!
Please & Thank youu :DDD
 
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