48. In PML when Clark tells Miranda, "Yours had a very interesting aroma. Is it animal based?"
Miranda responds, "You have a remarkable olfactory sense, Mr. Kent."
Lois wonders how Clark could get "animal based" from the sweat sock smell of Miranda's perfume.
Later, when they learn that Revenge contains pheromones, she realizes there is no way "average Joe" Clark Kent could have smelled the pheromones and known they were animal based. Then she remembered his odd comment about how Miranda's "pulserate was over 150" and the fact that her besotted partner was anything but during the Revenge outbreak. Knowing that he would have to be Superman *not* to be affected by the perfume, she deduses that Clark is Superman. She decides not to tell Clark and to seek revenge of her own. So when Superman is "affected" by the perfume the next day at the airport, Lois take full advantage of her knowledge that Superman is Clark Kent (and not really affected) to kiss the heck out him.