I doubt Lois would trust Superman from the first instant if he were masked. She'd work doubly hard to unmask him.
I agree. Then again, eating a bomb that saves her life would still make a good first impression and help him gain a level of trust with Lois.
The triangle-for-two would probably not be an issue for Clark and their relationship might go more smoothly if Superman were masked but when Lois finds out the truth, WOW!!