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?
Open relationship
An open relationship, also known as non-exclusive relationship, is an intimate relationship that is sexually non-monogamous. The term may refer to polyamory, but generally indicates a relationship where there is a primary emotional and intimate relationship between two partners, who agree to at least the possibility of intimacy with other people.
Open relationships include any type of romantic relationship (dating, marriage, etc.) that is open. The concept of an open relationship has been recognized since the 1970s.
Types
is monogamous.
- Swinging, in which singles or partners in a committed relationship engage in sexual activities with others as a recreational or social activity.
The term open relationship is sometimes used interchangeably with the closely related term polyamory, but the two concepts are not identical. 
The main unifying element to open relationship styles is non-exclusivity of romantic or sexual relationships. Another generic term for all these types of relationships is open love.
Types of open relationships Swinging.
Swinging is a form of open relationship in