Newsflash, all anyone does anywhere is drink. It's code for "I don't have anything productive to do so lets get sauced up."
I'm blowing the drinking and driving out of proportion? You said that you have saved her multiple times from getting behind the wheel torn up. Also, I'm not saying that just because someone drives drunk means that they are likely to cheat, but she loves to party, loves to drink, and apparently loves to do incredibly reckless things while intoxicated, you know like drive drunk or jump on a penis that has no condom on it.