Maybe An Hemophiliac
"Well, I have noticed lately that if I get even the tiniest cut, it seems to bleed for hours" she replied. "Do you think I might be a hemophiliac"?
"Well, hemophilia is a genetic disorder and it's most often found in men," answered the doctor. "But, some woman do get hemophilia. Tell me, how much do you lose when you have your period" asked the doctor?
After some quick calculating, the hooker replied, "Oh, about seven or eight hundred dollars, I guess".