Is multiple marriage forbidden

Answer 1

Answer 1
It is forbidden in Christianity although a minority of churches allow same sex marriage. This led many Christians to seek sex outside marriage when they get into problems with their licit partners.

Per Islam teachings, it is allowed for a man to marry up to four wives but subject to specific conditions that make it not so widely applied unless in a very specific cases. One of these conditions is to treat wives equally. Another condition is to seek approval of former wife (or wives) otherwise they have the right to seek divorce. One of the reasons that may justify marriage with a second wife is to have your first wife so ill that she can't perform sexual relation with her husband. Another reason may arise when a wife got widowed and has children and needs a husband to share the responsibilities of raising up her children and save her from practicing illegal sexual relationships that are strictly forbidden per Islam teachings.

Answer 2
In most Western countries, polygamy is forbidden. In several Muslim-majority countries it is permitted.