Ive met chicks with high sex drives who loved sex, total freaks, who were absolutely horrible in bed. Only thing in common I noticed chicks who were good in bed had was that they loved to dance and danced well, very confident in their bodies.
Idk about dancing, but a said gf was one of these "angel looking" innocent, sweet, cute girls in every day life. Noone would've suspected of what kind of a crazy sex addict she is lol.. And I liked that.