Key word: "afterwards"
however, he also said double checked. inferring that he has checked before.
Inferring that he made a casual reference to himself posting a photo of her on the internet, and took her smile and laugh to mean "yah, you can totally put my photo in a place where it will be circulated forever among horny history buff nerds."
He just got lucky she did in fact mean that...what a whore.
Speaking of whores...*decides not to post a photo of his EX*