You know this scenario: Your doctor is an hour late for your annual exam appointment. You’re quietly shivering, half-dressed in a paper gown, kicking your feet and anxiously trying to keep track of all of the questions you want to ask your doctor. Maybe you just started having anal sex with your partner, and you’re worried you’re going to get some kind of infection if you’re not careful. The doctor sharply knocks on the door. Showtime. The next ten minutes…