On the one hand, you're right: it would be simple to just move to Bangkok and have the agent fuck left and right (and above and below, and...). But very quickly the game would stop being re-playable; it would just be akin to all those VN-prefixed (Virtual Novels) games that one can find on this site, with, like you say, a bit of variety due to the various sexual traits, and minus the great CG's that most of those games offer. What the dev has in mind, I believe, is to make a game that would be different every time you play it; you'd be in Bangkok, walking back to your house/apartment/room after a "working day", and thugs would start chasing you -- your chances of evasion depending on your accumulated skills in running... Or you'd be sucking some new client when you'd overhear something of interest, though not related to your main mission, and your chances of success at pickpocketing him (and then somehow relaying back the info) would depend on some other skills. Just multiply these real-life simulations at every step, always depending on dice rolls, but with your XP factoring in in all sorts of domains/skills areas...
It's a fascinating project.
