The OP isn't making absolute points, this is the point. An ant isn't really an organ, at least using normal word meanings. He means that it is effectively an o

The OP isn't making absolute points, this is the point. An ant isn't really an organ, at least using normal word meanings. He means that it is effectively an organ, from a reproductive perspective. People obviously are viable reproductive organisms in a technical/literal sense. But... the way people (and our nearest cousins) actually reproduce is in couples within a tribe/village/troop. People are evolved to reproduce this way and people evolved by reproducing this way.