Would having great cardio, stamina, ENDURANCE mean you can satisfy her more or not necessarly?

Not necessarily at all. It would mean he could maintain his end of the activity for an extended period, but her satisfaction isn't necessarily tied to his endurance (it's more about skill).

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Not necessarily. It also depends on how long it takes you to reach orgasm. If you're a two stroke screamer she's not going to have a good time.  That said, being fit won't hurt.