The libertarian argument is in favor of gay equality.
Sexual orientation, preference, gender, or gender identity should have no impact on the governments treatment of individuals, such as in current marriage, child custody, adoption, immigration or military service laws
Completely false.
What is false about it, libertarianism discriminates against non-heterosexuals?
1.3 Personal Relationships Sexual orientation, preference, gender, or gender identity should have no impact on the government's treatment of individuals, such as in current marriage, child custody, adoption, immigration or military service laws. Government does not have the authority to define, license or restrict personal relationships. Consenting adults should be free to choose their own sexual practices and personal relationships. http://www.lp.org/platform