What do I do if my brother has decided he wants to be a prostitute?

My brother took me aside yesterday after a family dinner and told me he's considered becoming a prostitute. He said he would love to make money "to get ****** by millionaires and old chicks with experience." This came out of nowhere because he's a 28-year-old professional in marketing. He's doing pretty well for himself, but he seems bored with it.

I've never known him to be a promiscuous person, but when he talked with me last night he told me about how his life has become a "joke" and that he wants to be taken seriously as a "working man." He wants to get offers mailed or emailed to him at the office where he works because it would "be edgy," and then he would seek these people out at night and bring them what they want, kind of a risky escort service.

I asked him how he'd get started and he said, "I don't know. I might just go to the street corner in the city and wait around. See what it's like." I didn't bother telling him he kind of looks like Steve Buscemi and probably won't have any luck, but I also don't want to hurt the guy's feelings, either. I also didn't bother telling him women don't hire male hustlers as much as rich/married closeted gay men.

What should I do about this?