I think open relationships are interesting but its personally not my cup of tea
An open relationship is an intimate relationship which is con-sensually non-monogamous
Right. I wonder when that started as an actual label 
This term may sometimes refer to polyamory
Yeah that is the same thing right
But it is often used to signify a primary emotional and intimate relationship
Interesting. Was this term coined by a specific person at some point in history?
The concept of open relationship has been known since the 1970s