Originally Posted by The Infernal
Personally I think the bigger sell having Perry and co. not think Clark and Superman look awfully alike. If that can be accepted then I can't see anyone batting an eyelid at Lois and Clark being married or even just a couple (which is likely where they're headed at least considering MoS).
I think the sequel will have Superman and Lois as an established couple, with them having got together prior to the events of the film. That way the relationship development won't take up focus.
Clark however? It would be suspicious for Lois to be in an open relationship with Clark when everyone knows about her connection to Superman.
It would undermine the whole point of the CK disguise.