Crissy was born an orphan and naturally looked like a complete ditz and was treated as such by the other kids and adults. Yet behind her looks was a brilliant mind that was far beyond the normal brain. Still, she lived in the orphanage and had a relatively easy and happy life with the various kids that came and went. But when she was 16 she learned that looking ditzy also meant people thought you were slutty and when a new orphan arrived, he decided that she would be his personal slut.
For the next two years till she till turned 18 and had to leave, she was used by him and others for their enjoyment. But; during that time she could have left at any time. The reason she didn't was because she found the act of sex to be interesting and used those two years to study every facet of it in the most ways she could. When she left there was not a male in that place including the faculty that she had not fucked in every way possible.
Since then she's started her own business and has built enough capitol to do as she pleases yet she still has an intense fascination with sex and wishes to study every facet of it. Even the darkest and most depraved; her mind will not rest till she either learns it all. Or she finds someone who can sate her.