well, in case anyone cares for my opinion, which...yeah..., i would have much more of a problem with a woman hiding the fact that she was a prostitute than with the fact that she was a prostitute. now obviously, this doesn't mean you have to come out on the first date and be all like, 'Hey, btw...', but if we're talking serious relationship it should all be out. i can imagine marrying someone who was once a prostitute; i can't imagine marrying someone without the mutual knowledge and trust of each other necessary to allow something like this to come out.
then again, i also think prostitution should be legal, so maybe most people have more of a problem with the act itself than I do (i.e., as usual, ymmv).