Ok, before starting let’s make it clear that the idea of threesome marriage is in no sense related to porn or such things. It is just an idea with a non erotic meaning.
Two is a company, three is a crowd.
This is an old saying.
But then why do we approach to a third person when we quarrel? Why do we need a third person to have a change in life? Why is it that people complain about ‘breach of personal space’ when with a partner?
May be we are made like that. May be it is natural to have quarrels with a person with whom you spend all of your time. And may be that is why there is always a need of a friend or a family member to whom we can approach in times of sorrow.
Well this situation gave me a hypothetical idea of a Threesome Marriage.
Devil's Journal 