The question is a mystery to me....when talking about having your mate sharing their affections for another are we to mean love/sex or a special friendship kind of affection?

If it is of friendship, then I can whole support that. Compassion for another is a special thing that too few of us express to others, and I am just as guilty as the next person.

As to love/sex well that is a difficult matter to think upon. I like to humor myself that I am an open minded person believing anything is possible. Though I suspect, it would matter about the circumstances and understandings of the relationship.

All I know is that for myself, I could not accept either a friendship love or a romantic love for another without my mate's approval. But then I would not likely seek out another person to have feelings for.