Previously in this series: If Serena Williams Were Your Girlfriend If Kal Penn were your boyfriend, you wouldn't fight often. Not because you don't have arguments -- you definitely have arguments -- but they tend to be worked out more quietly. Your debates , however, tend to descend into nonsense when you get into the "agree to disagree" phase. "No, you're wrong and dumb and your opinion is wrong and dumb!" "Fine! I don't care!…