I think it depends, if you are just friends, it might be improve the friendship.
But if you have a girl, and then fuck with another guy, she might like that guy better (better dick). Or the girl is more beautiful, and your girl is insecure.
I would suggest, that you don't do a 3some with 2 girls, if your girl isn't into other girls too...
But then maybe as a fantasy it would be better than as reality...
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100% agree. It's a nice fantasy, but nothing more. Maybe if you are all friends, but not if you are in a committed relationship, that's just too risky...