While most folks are busy castigating Sen. Rick Santorum for comparing homosexuality to incest and pedophilia (criticism he clearly deserves), the libertarian wing of the blogosphere has stopped to ask: why shouldn’t the right to sexual privacy protect consensual incest between adults? Fellow ex-debate-geeks Glen Whitman and Amy Phillips have weighed in, as has Eugene Volokh and the distinctly non-libertarian Matthew Yglesias.