I think that there are people for whom poly is very specific to the people, and there are still others who are out looking for another. I tend to fall in neither of those categories - I have known from my teens that it felt right to love more than one at a time, and didn't see why, when I started a new relationship, I wasn't allowed to say I still loved my "ex".
Now, I am in a situation where I am open to whoever comes into my life, be they friend or lover, but don't go out searching for another person.
"Listen, or your tongue will make you deaf." - Native American Proverb