How long should a girl hold off sex with a guy if she wants a serious relationship?

I've been dating this guy for about a week. We have so much in common and we finish each others sentences. Things are progressing so fast and were trying to take things slow. We don't want to mess up what we have...It's so great. We have intense make out sessions. How long should I make him wait if I want a serious relationship? Everything with him feels so right and I'm trying to hold myself back.
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