In a serious long term relationship I have serious doubts that any human being can deal with the involvement of a third party.
It seems to me that we are programmed from birth to accept that a single partner is the norm and that group sex implies that none of the players are truly committed.
This might not be true in practice buts its very hard to overcome our programming. I certainly would not be comfortable seeing my beloved with someone else, regardless of gender and doubt that she would be comfortable with doing it either.
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The Grumpy Old Bloke
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