Is it unreasonable to ask a man to wait to be intimate with you until you’re in a relationship?

A man on a dating app told me it’s not reasonable to wait to have sex until you’re in an official relationship, and that you have to have sex before you fully commit to a relationship to know if you’re compatible. I want to wait until I’m in a relationship
Is it unreasonable to ask a man to wait to be intimate with you until you’re in a relationship?
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