Claim: LGBT movements are supported unanimously, sexual relationships with people other than an opposite-sex spouse undermines the traditional family and opponents say legalization of same-sex marriage will open the door for the legalization of polygamy which is marrying more than one person.
Evidence: Some social conservatives believe that all sexual relationships with people other than an opposite-sex spouse undermines the traditional family and that children should be reared in homes with both a father and a mother. Opponents say same-sex relationships are not marriages, that legalization of same-sex marriage will open the door for the legalization of polygamy, that it is unnatural and that it encourages unhealthy behavior. Polygyny (/pəˈlɪdʒɪniː/; from Neoclassical Greek πολυγυνία from - poly- "many", and gyne "woman" or "wife") is the most common and accepted form of polygamy, entailing the marriage of a man with several women.