Promiscuity

Some men find it sexy when a woman is a virgin, some find it sexy when she has experience. What if one of these actually determined how sexually desirable she was physically? In one world, a woman would become increasingly desirable with every new partner she had. Her physical desirability would increase as she became more wantonly sexual and promiscuous. In the other, even a single partner would take away some of what made her so sexually desirable, but sticking to a single partner would allow her to remain nearly as attractive as a virgin.