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So, you've successfully gamed and you're horizontal. How (and when) should you signal that you don't want a romantic relationship but are up for FWB, without coming across like a jerk who's only interested in one thing? Can you be the good guy before the act by managing expectations and yet still close properly?
You don't have to, because relationship isn't implied by sex.
If you can get to the point of sex and you haven't said "I love you" or "I want you to be my girlfriend" or "I only do serious relationships," then you need say nothing. Your lack of saying something more is enough to make it known.