That's what Randi Harrison said happened, back in the 1980s, when Ailes was at NBC, according to “The Loudest Voice in the Room,” a 560-page biography of Ailes by Gabriel Sherman. The book also relates an anecdote from the 90s in which Ailes probably used "an obscene phrase with the words 'little' and 'Jew'" in speaking about some rival executive at NBC.
ADDED: The author says he did 614 interviews. Consider those 2 anecdotes — from 20 and 30 years ago — in that context. Not much of a portrait of evil, even assuming the stories are true!
The offer of $100 is a bad joke. If he'd really wanted to buy sexual access to an employee he'd have offered a lot more or offer it per encounter. Who would agree to step up to a sexual encounter whenever the other person "wants" it? Maybe you can get your spouse onto that arrangement — and I think you should try! — but that's not something you can buy… not since the days when you could buy a slave.
And as far as the anti-Semitic remark, it was directed at a particular individual, not an expression of an actual opinion about the group (even if it's some evidence of his view of the group). Ailes had a longstanding battle with one guy, and one time, that hostility manifested itself in a reference to his enemy's religion/ethnicity. 614 interviews produced no other anti-Semitic remark? That's actually rather strong evidence that he's not anti-Semitic.