A free agent is
a person who maintains multiple romantic relationships but keeps
these entanglements isolated from each other. They identify as
single, which may not be how they are perceived by their multiple
partners. The polyamory practices of a free agent are their own, and
not something agreed to by their partners.
More About Free Agent
The common perception is that a free agent only cares about themselves, and not the feelings and expectations of their partners. This is because the ideal is to always reveal ones polyamorous practices with partners. Before the anything sexual happens or before a romantic relationship moves forward, the people involved should be on the same page.