I've known several girls in the business who have made a love match with a client in tha past, some stopped working, others didn't.
I don't write off the idea of falling for a client (you don't have much control over your heart afterall!) but I am pretty good at keeping my two lives distinct and seperate.
As for clients dating sps, I know very few men who would be okay with their love being with other men but there are many out there (of both sexes) who would have no qualms about it (ie: those in the swinger lifestyle). I admit I would have a difficult time with someone I was in love with being with anyone else, I guess that makes me a hypocrite