I favor the privatization of marriage... A marriage is a private contract between two individuals.

This position is seconded by Jennifer Morse of the Witherspoon Institute, who argues that if literally anyone can define marriage as whatever they want, the state forfeits the ability to sufficiently secure the best interests of children. She goes further, arguing that the logic of marriage privatization "at the expense of children, is a concept developed by adults that will benefit only adults."^[16]

Stanley Kurtz of National Review has written that privatization would be a "disaster". He argued that government "still has to decide what sort of private unions merit benefits... under this privatization scheme", and then "we also get the same quarrels over social recognition that we got before privatization." He commented that the government will have to deal with polygamous, polyamorous, and incestuous relationships attempting to obtain contracts under the new scheme as well as attempts by heterosexual acquaintances to make "marriages of convenience" to obtain things such as spousal medical insurance.^[17] His National Review colleague Maggie Gallagher has also called privatization as a "fantasy" since "[t]here is scarcely a dollar that state and federal government spends on social programs that is not driven in large part by family fragmentation:

http://en.wikipedia.org/wiki/Marriage_privatization

Although in general the Romans regarded marriage as a heterosexual union for the purpose of producing children, in the early Imperial period some male couples were celebrating traditional marriage rites in the presence of friends. Same-sex weddings are reported by sources that mock them; the feelings of the participants are not recorded. Both Martial and Juvenal refer to marriage between men as something that occurs not infrequently, although they disapprove of it.

http://en.wikipedia.org/wiki/Homosexuality_in_ancient_Rome

Another  link that I found interesting ...

http://en.wikipedia.org/wiki/Minarchism.  I am sympathetic to Minarchism, although I don't think that we can function without some regulation.