Just thinking though....really, how many bare chests would Lois really have seen btw seeing Clark's and then seeing Superman's? She definitely gets an up-close look at Clark's in the pilot--which would have to be burned into her memory
--and besides Lex and Dan, really doesn't date anyone else throughout the show (and we know they are not built like Clark/Superman).
I can see her very fondly remembering Clark's from when they first met (come on, how could she not?!?
), and getting a sudden jolt of recognition in seeing Superman's....(not to mention, all of the other similar physical characteristics they both share, as mentioned previously)...
Laura