Or, is it legal to have gay sex in your own home? This week, Marcus McCann takes us back to the 2003 Supreme Court case that challenged a Texas anti-sodomy law--with little stops along the way for Mexican food, the endowment of James Dean, and peevish police. (Part 2 coming next week!) Dale Carpenter's book Flagrant Conduct: The Story of Lawrence v. Texas Marcus' book Park Cruising: What Happens…