Should open marriages work or how good it's in long run?

I am dating a girl who is in love with me and wants to marry me. At the same time she wants to continue her affair with a married man. She tells she has always fantasized being the mistress and it helps her to crave her wild side. Also her sugar daddy pays her well. She is ok with open marriages and encourages me to do so also. Even she found a girl for me someone among her friend for casual encounters , for time she is busy. I know it fulfils every fantasy of a teenage boy 😜😆😆but in reality will it work... Any opinions?
Should open marriages work or how good its in long run?
Open marriages work
Open marriages will not work
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Should open marriages work or how good it's in long run?
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