Now it just feels like one of those chapters they add to a textbook so college students can’t buy the used edition at half price.

Doesn’t it seem like we’ve already learned everything possible about politicians’ peccadilloes (emphasis on their peccas) for more than a year? Thanks to Eliot Spitzer, Governor Paterson, Vito Fossella, Governor McGreevey — back for second helpings of humiliation — and, of course, restless leg Larry Craig, it’s like we’ve taken Advanced Placement Sleaze and aced it. We officially are adults now, just like French people, but without the delicious pastries and nude First Lady.

Just in case there’s a pop quiz, however, here’s a cheat sheet about cheats between the sheets:

2. When a politician says he did not have sex with “Person A,” it’s because he doesn’t yet realize that there are photos. And a wiretap. And a guy from the National Enquirer.

3. And sometimes a receipt.

4. Also “Person A” is blabbing to half the world and keeps cashing campaign checks.

5. You don’t have to be a young woman to be a powerful man’s mistress.

6. Sometimes, you don’t even have to be a woman.

7. Men in power choose their paramours by proximity, peroxide, or payment method. Or by whoever’s in the next stall.