The sexual art of pulling out just before you ejaculate, and blowing your load* all over her chest, screaming AVADA KEDAVRA! If you are agile enough to fuck whilst standing up, she may fling herself backwards and die. Bonus points if she receives a legitimate injury.
Someone who jumps from one relationship immediately into another one.
Serial monogamists can not stand to be alone and often suffer from vast commitment and insecurity issues.
Because they jump into relationships immediately after the previous one has ended, serial monogamists typically don't take the time to reflect on their behavior or why their previous relationships failed; thus, they end up making the same relationship mistakes over and over again.
Person 1: Damn, Dustin already has a new girlfriend?! It's only been two weeks since he broke up with his fiance! I think he's a sociopath.