Often there is also a spiritual part of marriage. In addition to the civil act (wanted by the state) there is sometimes a religious one. A Christian marriage ceremony usually happens in a church. In a Christian marriage, both partners promise to love each other for the rest of their lives. There are certain restrictions on who can marry or be married; those closely related, like brothers and sisters usually cannot marry. This is usually to prevent genetic problems for the children. Those marrying also have to be of a certain age to be able to marry. If that age is not specified it is usually the age of consent. In Hinduism marriage is considered to be holy and is seen as a union of the goddess "Laxmi" and the god "Narayan".