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Islam demands its followers to keep up the ethical standards. These ethical standards are established by the people in the forms of laws, rules and norms. Islam legislate only in the matters where human cannot formulate an appropriate law. The rest is their domain to legislate. The laws for the particular issue you cited are to made by man. Man made laws can be different in different places and can be improved. One has to follow the laws and rules and norms one is dealing with.