A ‘Don’t ask, Don’t tell’ was agreed between the husband (her lover) and his wife before Stephanie came onto the scene, and was not open to negotiation.
But for those who are monogamous – especially as explored in Twice – the paradigm of a monogamous male with a polyamorous female – the struggle is wholly different. Society emasculates their stance as they struggle with opinions which may define them as cuckolds, whilst shame and guilt compound the difficulties.
I think a lot of people see gender as something malleable. That I put on a dress and act like a woman, so one day I could choose to act like a man again.