Great deal and always are two very different words with very different meanings and implications. Also remember I am not talking about bigamy in general, but what would be a semi-logical conclusion to a world where it becomes fashionable. People have the capacity to do shit just to be viewed as hip, and they've done it for anything considered a fringe group since fringe groups have existed. Briefly wrapping things up before work, but I'd not be comfortable with my girlfriend or wife being with anyone else, regardless of gender. That's a personal choice on my end, and if other people are okay with it that's fine, but I don't aspire to any other types of relationships. Its still cheating, guy or girl, and it still breaks trust. Neither option in this world is right or wrong on a moral scale, just a personal one.