Willy, you should just do a google search on it to get more information. The Mormons in the US accept polygamy as a viable option for marriage, and regularly practice it particularly in Utah. Polygamy is a common theme in the Bible itself, as many of the prophets and revered men practiced it (David, Solomon, Abraham, Jacob, to name a few). There is absolutely no condemnation of polygamy in the Bible, so the fact that it was practiced and not condemned is evidential proof of polygamy in Christianity. Monogamy arose later and is more of a Western innovation.
There are blogs online written by women in polygamous marriages that you can find via a google search. That might be a good resource as well.