Homosexuality, incest and bigamy
Fantastic discussion here on Senator Santorum's remarks that:
( nice dissection of the issues from a libertarian perspective )
And if the Supreme Court says that you have the right to consensual sex within your home, then you have the right to bigamy, you have the right to polygamy, you have the right to incest, you have the right to adultery.
( nice dissection of the issues from a libertarian perspective )