Polygamy has many condititons and it's not for having fun as many people think !
In Islam, polygamy is allowed for men (making it polygyny), with the specific limitation that they can only have up to four wives at any one time. The Qur'an clearly states that men who choose this route must deal with their wives justly. If the husband fears that he cannot deal with his wives justly, then he should only marry one.
According to traditional Islamic law, a man may take up to four wives, and each of those wives must have her own property, assets, and dowry. Usually the wives have little to no contact with each other and lead separate, individual lives in their own houses, and sometimes in different cities, though they all share the same husband. Prophet Muhammad, who had a monogamous marriage with Khadija for twenty five years till her death, married many of his wives because they were war widows who were left with nothing and took care of them. Thus, polygamy is an exception rather than the rule and is traditionally restricted to men who can manage things, and in some countries it is illegal for a man to marry multiple wives if he is unable to afford to take care of each of them properly.
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I'm from Egypt.