I am someone who rebounds. It has absolutely nothing to do with replacing the relationship. It has to do with.. moving on. It creates a disconnect between me and the previous lover. It occupies a time and space during the mourning period.. oh and of course its fun as hell.
Only in this world have I heard of it as a relationship replacement. Its usually just a way to get out from under the mourning of a relationship loss.
I would be extremely hesitant to start a relationship with a rebound. Too much overflowing emotion to really trust my feelings. I trust one set of personal rules since starting poly, I very rarely love.. I often crush.. and when I rebound, its best just to let that devil lie.
And yes, those I am rebounding with do know.. I am not hiding the fact I am there for sex. Consensual fun short term sex..