same-sex marriage

Most of people talk about marriage is one mother and one father. As "gay marriage "become legal a lot of protesters against the same -sex marriage. Some of them think same-sex marriage is not good to children and family. Children lack of father's love or mother's love in same-sex. In the childhood, both of parents' love are necessary to children. Whenever they lack which part their life will not be normal as it's supposed to be. But I totally disagree.