Does having sex too early necessarily mean a real relationship isn't possible anymore?

If i have sex with my coworker on our second date, will he see me as an easy hook up, or perhaps a friend with benefits? will this ruin my chances of a real relationship with him?
Updates:
17 d
I want to add that we have known eachother for over a year now and see each other daily. This would be a second date 'alone' but we have hung out plenty of times in a group
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