I don’t see your problem.
A “regular Asian girl”? What the fuck’s that? A woman that dresses conservatively, knows how to cook and attends church ?
Come on. Look for the usual tell tale sighs of a whore - her face and eyes, that crooked smile, if she smokes she pokes, perhaps a tattoo or two, her general appearance and the way she carries herself. And if in doubt just ask. What have you got to lose. At worst you’ll be told to fuck off.