What is the ruling for one who repeats intercourse in Ramadan?

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Whoever repeats intercourse in the same day, one expiation will be sufficient for him; this is without any disagreement amongst the scholars.

This is because he invalidated his day’s fast by having intercourse the first time; therefore, if he has intercourse again, he does so upon a fast that has already been invalidated. One expiation would thus suffice for making up that day.