It's strange, reading FMAB fic where there's any exploration of Roy's background because many authors will acknowledge he grew up in a brothel with a bunch of professional whores as family but I've never seen one really explore how that would affect his philosophy on life. Nor have I seen one where he actually pays for it. In fact, most fic I've read that even touch on it make a point to reassure the reader that He's Never Hired A Prostitute.
I don't know if it's western/american puritanism or a foundational belief that Good Men Wouldn't Do That or what.
Like, yeah, he calls a bunch of Chris's employees his sisters but they're not really related and not every employee is going to be that to him. Chris will have hired on new girls since he moved out, for one.
Personally, I figure the mystique around sex and prostitution would have long worn off and he would have a very practical view on the matter. You hire a plumber to update the pipes, a mechanic to change your tires, an accountant to do your taxes, and a prostitute for sex. They're professionals, its just a job.
In my fic, Roy really only ever has sex with professionals after Ishval. He sees sex as transactional and so is perfectly happy to pay for it. Keeping sex as a business transaction also protects him from anyone catching feelings or becoming a liability to his ambitions.
And, because this is a royed fic, Edward Elric comes crashing into his life and his heart.
