2 Expanded and maybe fixed the answer
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'Cause it's cool [1].

(Sorry, that really isseems to be the only reason. None other is given in the books or movies. According to popular legend Stephenie Meyer literally dreamed it up.)

[1] may also be considered "cute", "fun", "beautiful", "amazing", "inspiring", "dreamy", "gay" (as in happy by the writer(s) and real fans.

'Cause it's cool.

(Sorry, that really is the reason)

'Cause it's cool [1].

(Sorry, that really seems to be the only reason. None other is given in the books or movies. According to popular legend Stephenie Meyer literally dreamed it up.)

[1] may also be considered "cute", "fun", "beautiful", "amazing", "inspiring", "dreamy", "gay" (as in happy by the writer(s) and real fans.

1
source | link

'Cause it's cool.

(Sorry, that really is the reason)