I believe this question was answered nicely in Action 484, the Earth 2 Lois and Clark wedding issue. The Wizard cast a spell to get rid of Superman, and this happened by Clark's losing his memory of being Superman. With no further reason to maintain his disguise, in time Clark stopped acting like a slouching milquetoast, and the "real" Clark Kent - a confident, assertive, and yes, even "heroic" - hard-hitting investigative reporter emerged in his place. Lois quickly took notice of the "new" Clark, they fell in love, and they married. The Earth 2 marriage of course endured even after Clark got his memory back and became Superman again, and it lasted until Lois's death in Infinite Crisis. I see no reason that this same scenario would not also apply to "our" Clark and Lois.