A person who can adapt oneself to different possible sexual situations without losing the general overview for attractive male/female partners to honk.
The sexameleons theme is and will always be: "Mojo's rising". Ever.
While hunting for an attractive, ney: mind-blowing dark-haired woman, small height but with great big boobs and a big but apple-ish rear end, the sexameleon gets sexed on from a tall blondy with small/er honkydonks and a more pear-ish butt.
Knowing the value of the situation for having a possible good sexual outcome, the sexameleon retrains its instinct and focusses on the new prize.
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.