The Qur’an Is the only holy book that actually says “Marry Only One”
"Marry women of your choice, two, or three, or four; but if ye fear that ye shall not be able to deal justly with them, 'then only one.' (An-Nisaa’ 3:3)"
Polygamy in Islam is not recommended, it is only permitted under certain guidelines. permission to practice polygamy is not associated with mere satisfaction of passion. It is, rather associated with compassion toward widows and orphans. the verse revealed to the Prophet (p) that gave man a choice of marrying up to four women was revealed to solve a major social problem to prevent major sins such as illegal sex and prostitution. the purpose was absolutely not for man's sexual pleasure nor privilege.
this verse was revealed at a time when the pagans declared war on islam when it was revealed a number of times, due to these battles muslims suffered a dramatic decrease in the number of Muslim men. this loss had left so many Muslim women Widows and not able to get married if they were single.
also one of the signs of the day of judgement according to the hadiths is that women in the future will out number men 50 to 1, today If every adult American man married only one woman, there would still be more than 25 million women in the United States who would not be able to get husbands, at least considering that according to latest statistics, 10 percent of the american population is gay, that’s close to 30 million people, same with many other countries where women have a much larger population than men.