How often does attraction develope compared to already there with your friends?

4everconfused
Okay boy meets girl, girl meets boy... whichever you prefer. When become friends with the opposite sex, are you always attracted to them or does it end up developing? I'm not talking strictly platonic friends but friends that at one point or another you want to have sex with them. I, for example, if I am not attracted to my guy friend to begin with, I never seem to develope an attraction for him. The friends that I end up sleeping with are always ones that I was attracted to from start. How's it normally go for everyone else?
How often does attraction develope compared to already there with your friends?
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