Without sex, you don't have a relationship with her yet, no matter what you've done for her.
Sex is the ultimate decider of a relationship. It is so because it's her strongest card.
(You can't claim to have conquered a kingdom when its King still stands tall.)

This is why women often weaponise this card by giving you "no-sex-till-marriage" clause.
She knows if she drops her guard to allow you entrance to her "Holy of Holies", she becomes a conquered territory & may no longer hold much value in your eyes.

For a relationship to exist, she must be willing to drop her guard in trust that you won't let go after seeing her vulnerability, her most prized possession.
For that's only when she's truly conquered.