Would you be willing to share your SO with another person even if you are open minded?

Would you be willing to share your SO with another person even if you are open minded?
Do you find that as being unfaithful and cheating? Would you be able to tolerate that?

I just read this on the news and Im a bit confused as why some people can tolerate this behavior I know I can't, as how could you really.

There is a story of 2 couples who met on the interne they fell in love and deicded to move together the 2 couples. Do you think for their children the way their parents live is healthy for them? Not even knowing who is their fahter or who your mom cheated with in order to have you?

Here is the link of those news. I mean not beause that is politically correct or we are in different times and in the 21st century that means it is something normal to look up to.

https://www.mirror.co.uk/news/real-life-stories/were-polyamorous-relationship-dont-know-26913985
Updates
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Many people had commented here about they are not willing to share your SO with another one. but did you really read the link I posted of those British couples who live together where there are even children involved and the way they were conceived? Poor kids
Would you be willing to share your SO with another person even if you are open minded?
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