A person who labels themselves under a certain sexual orientation, but is flexible beyond those restraints if they choose or if it is demanded of them.
My homie straight but in prison he was a flexosexual during is 10 year sentence.
Sarah only dates guys, but became flexosexual when Taylor Swift wanted to be her girlfriend she went along with it.
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.