There was a rumor going around my high school that a particularly well-endowed and slutty girl used to let the Spanish teacher feel her up after school every day to get an A. Right in class in front of everyone, with no shame at all, he would ask her to stop by at the end of the day for some additional "extra credit" work. And we'd catch him staring at her during tests and stuff. Creepy.
Of course back then it wasn't creepy at all and the dude was my hero because she was completely hot. Everyone else has to polish themself off at night and here's this guy in his late 30s getting a piece of the promised land. It was never proven, but when a complete moron gets an A in a foreign language class I think it's safe to say.
Anyhow my point is that even though you aren't stupid by any means, you maybe could have boosted your grade a bit.