Will somebody please remind me how the pheromone worked again? ... I don't think he was sprayed with the 100% concentration. As I remember, Miranda sprayed Luthor with the pheromone at close range, so she couldn't have used a 100% formula.
Miranda tells Lex how they should spray the whole of Metropolis with the 100% solution because the effect is the same as the dilute stuff, but permanent. Immediately afterwards, she sneaks a spritzer out of her pocket and sprays him, then herself.
I can't see what she would hope to gain by spraying him with the dilute stuff at that point, so my interpretation is that Lex gets a permanent dose of sexual-inhibition-remover. And as we all know, he subsequently waxes lyrical over Lois at dinner.
So however he might have felt about Lois beforehand, from that point on it's fair to assume he has a single-minded love/obsession for Lois. That would explain his behaviour in Fly Hard.
Mere