Quote from Meta
Best way to ask: Just don't. Never ask. Just hang out with him/her and when you have kissed then you don't have to ask anymore.
I can't quite agree on that.. only because some people are just really dense.. And another reason is a kiss doesn't exactly signify wanting a relationship because it can be interepted in way too many ways nowadays (like, I just want in your pants; I'm horny and you're the closest body; on a whim; ect, ect.).
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If it weren't for the gutter, my mind would be homeless.