I'm not sure I believe the prostitutes thing.
I don't believe he was a whale And in fact, he mostly stuck to +EV or small -EV machines, so casinos didn't love him as much as it's being portrayed. I think he ran enough coin-in to get comps, but he wasn't someone they would do something unusual for, such as getting hookers for him. That sort of thing tends to be reserved for the really high rollers, as it's very illegal.
Also, note that his girlfriend was his own age. I don't know how much this guy really cared about sex. If he really was an old perv, he likely would have used his money to score a hot young chick, not a 62-year-old.
It does seem he probably cared about Marilou, thus sending her away and shipping $100k to her as a way to keep her out of the way and give her something as a goodbye present. The fact that he was dating a woman his own age shows that this was more about companionship than sex, so I'm questioning the prostitute thing.