In addition, marriage isn't always done with children in mind. There are currently no prohibitions against couples that don't want to have children or can't have children. Historically speaking, marriage was used primarily as a means of producing children and continuing family lines. But that's not the case anymore. The current laws say clearly that having children is not required for a couple to get married. Moreover, how will homosexual families prohibit nuclear families? What effect does one have on the other and what research verifies this?