As much as I like the idea of Lois and Clark being only exclusive to each other I'm really not to fussy about it mainly because I'm a big reader and so if the story interests me I will read it regardless of whether Lois and Clark are together or not. However, I also chose other mainly because as Laura mentioned
Lois needs Clark and Clark needs Lois.
without each other the two of them are miserable as you probably could tell by the way they look at each other.