There is some commentary on Ahri being made, but I don't think many of the people commenting are familiar with her lore.
Technically speaking, Ahri's lore only states that she used her (not by any means, insignificant) attractiveness as a lure, but doesn't state that she fucked any person that she lured.
She was interested in their spirits or life forces, not their dingers. She didn't kill people by having sex with them either (it would inappropriate, though interesting, to see how that translated to her combat prowess), she made them believe that they were going to get lucky and then killed them when they were alone using her other spells.
It's not incorrect to say that she stopped doing so according to old lore. Her entire motivation for going to the IoW was that her transformation also gave her a more human sense of morality, and seducing and killing people was starting to take its toll.
The more people she killed, the more human she became. The more human she became, the more her human sense of morality grew. The more her human sense of morality grew, the more horrifying it became to kill people.
She went to the IoW and joined the League under the promise that they would discover a way to complete her transformation without causing more harm (and thus, offending her new found sense of morality).
Of course, since the Old Lore is no longer Lore, she might as well be Garen's great aunt, twice removed. Until the lore team gets its shit together, pretty much anything goes.
Silly people.
