Prostitution means when someone pays someone else to have sex with them. In the Philippines, there are some places where people go to pay for sex with women. It is illegal because it can be dangerous for the women and also the people paying for sex. Women who work as prostitutes might be forced to do so because they don't have any other way to make money. They might also be at risk of getting hurt or getting sick if they have sex with many people. It is important to treat women with respect and not do anything that could hurt them.