Can Friends with Benefits (FWB) become a serious relationship?

iWANTitALL
I've been "dealing" with my friends with benefits for a little over a year and I know she really likes me but I've maintained our friends with benefits relationship because I have relationship issues but the thought has crossed my mind a few times since she knows me so much now and the sex is pretty good and she has a really cool down to earth personality. Has anyone turned their friends with benefits into a long lasting relationship or am I reaching?
Can Friends with Benefits (FWB) become a serious relationship?
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