How about this tactic that I have used before, escalate things up to the bedroom and the next morning call her and explain that you had a lot of fun last night, have a genuine conversation and then explain that you just can't go for the relationship. Only thing you could go for is an open one but explain that yous would still have great fun, going out to places, chilling out etc but you both will be able to go out, meet new people and experience new things. Explain that it's nothing wrong with her (because it isn't) you just want to live life to the fullest and you would prefer her doing the same rather than her tying herself up over you.
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She seems to like sex very much
Haha at least she's human
I wish you best of luck man
Happy Gaming
AFCCoffee