Re: The Libertarian Philosophy.
interesting topic slickstar. as someone who likes the libertarian system, I think too often libertarians get painted as libertines. the essence of the libertarian viewpoint boils down to: social or political change should not be brought about through force, unless it is for the enforcement of contracts.
there can however be bounds placed on the nature of contracts that reflect the ideals of the people. for instance, many (not all) libertarians believe that slavery is not a valid contract. therefore the nature of the marriage contract could also be restricted.
One can take the libertarian philosophy too far if social norms are not taken into account. You may be aware of the libertarian candidate in the US in the 80s, who could not bring herself to clearly condemn sexual relations with minors. there are clearly limits on the nature of contracts as well as an eligibility criterion.
also you may find this interesting, if not wholly convincing: a libertarian case for traditional marriage..
http://www.hoover.org/publications/policyreview/2939396.html
thought the arguments pertain to gay marriage, there is no reason why traditional marriage cannot mean marriage as is traditional in Muslim society.