You kids remember Lawrence v. Texas, the Supreme court case overturning Bowers v. Hardwick, and allowing us all to engage in sodomy in the privacy of our homes, right? Of course you do. Remember Scalia's dissent? Basically he was saying there was a legitimate state interest in regulating homosexual acts--states regulate all sorts of stuff, so why should sodomy be any different?
Apparently at a Q&A at NYU a law student demonstrated to Justice Scalia exactly why it's different by asking the justice if he sodomized his wife. Reason? Some things are nobody's business.
Read the law student's open letter explaining his actions here.