I m not telling that it's ok for some particular relegious person can marry many and others can marry one like that,I m not bringing Hindu or Muslim or Jew or xtian or anything. As a human being it's scientifically acceptable to have many partners. I think you are a man,now you tell the truth how many times did you fantasies about other women, I did it many times. So basically like other mammals we human beings are polygamous in nature,and that polygamous instinct in our gene is forcing us to search for many sexual partners,Atleat in our mind.
And in India, marrying many women at a time is prohibited by law and it's a criminal offence and will be procicuted in court,exceptions are allowed only for Muslims.