Some women in the sex trade in richer countries and states, such as the Netherlands and Nevada, argue that it is their right to use their bodies as they choose and that they have entered into sex work voluntarily. In these places and some others, groups and authorities have worked to regulate sex work in order to ensure basic health and wage levels. The question remains however: how limited is the range of choices for these women? Most women enter the sex industry out of economic necessity. Some, referred to sometimes as "floating" sex workers, fulfill traditional family roles in the daytime and earn cash at night as sex workers. In a survey of Kolkata prostitutes, 52% said they took on sex work because of financial difficulties. In the same survey, 28% reported that they turned to the sex industry as a result of spousal violence, 14% because of family problems, and 10% because they were deserted or divorced. This study suggests that, in addition to poverty, unequal social relations between men and women play a role in determining a woman's entrance into the sex industry. Some women in some countries perceive advantages to going into the sex trade, especially in countries where prostitution has been legalized. Incomes are sometimes higher than for factory labor, and the flexible working hours offer some women flexibility in their personal and sexual lives and make them less dependent on men for material goods. It is vitally important to remember that there are vast distinctions between women choosing sex work and others forced into sexual slavery. Studies have shown, however, that the great majority of women who enter the sex trade are either lured or forced into it out of economic necessity, having few or no alternatives.