Lois without her sexual past is a different person. Time traveling older Lois set a lot of things in motion that changed the character of the person Lois grew up to be. Lois is over-thinking every step with Clark, convinced she knows what Original Lois would or would not have done. But she can't know that - this Lois has a completely different frame of reference than OL, not just about Clark, but about everything in life, so she's not in the same position to make that determination. Oh, the problems of time travel paradoxes!
