Love is love. Some try to define it. Others allow it to retain it's mystic. Eaither way it is what it is, no more no less. When I love it is in total, they have my all, I don't hold back. This does not mean that I am incapable of loving another just as much.
A physical relationship allways complicates things, but "love" transends the purely physical, it is an exchange of the soul.
However I think this debate isn't really about love as much as it is about issues of property, ownership and jealousy.
For it is these feelings involving jealousy in paticular that get in the way of love. Especially important; yet not limited, to polyamorus relationships.
Many make the mistake of thinking it is thier love for an individual that makes them jealous of anothers affection for thier beloved.
This is a classic mistake and leads many relationships into a downward spiral.
It is in fact the jealous persons own greed to control the object of thier affections desires that is the root of this problem. Weather it is a jealousy of: ones profession, or another lover, or even a childs attentions, makes no difference, except to the preceptions of what the individual is willing to accept in each circumstance.
This is especially true in the relationship dynamics that take place between dominants and submissives.