PHNOM PENH, Cambodia

Western men who visit red-light districts in poor countries often find themselves surrounded by coquettish teenage girls laughingly tugging them toward the brothels. The men assume that the girls are there voluntarily, and in some cases they are right.

But anyone inclined to take the girls’ smiles at face value should talk to Sina Vann, who was once one of those smiling girls.

Sina is Vietnamese but was kidnapped at the age of 13 and taken to Cambodia, where she was drugged. She said she woke up naked and bloody on a bed with a white man — she doesn’t know his nationality — who had purchased her virginity.

After that, she was locked on the upper floors of a nice hotel and offered to Western men and wealthy Cambodians. She said she was beaten ferociously to force her to smile and act seductive.