Even a sex-worker does not deserve to be stabbed. From the other hand, if You are into this business, personal safety and precautions should be Your No.1 priorities...
Abandoned house at 1 A.M., hell, no, not for me. Even in "male" mode I would be extremely cautious if I had to visit such place (and the only reason I see doing such trip would be an urge for urban exploration or geo-caching) and I would deff take some self-defense items "just in case" and maybe wear protective equipment too... Those places sometimes are full with drug-addicts or there are such unpleasanties as used syringes etc. High boots, kneepads as minimum, light vest preferrably... - of course, sadly, if You are a sex-worker, You are not wearing those...