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pseudo-intellectual normative statements about what he/she should or shouldn't do or feel..
I'd say that a good portion of men's brains would start going into overdrive if they heard about their possible future wife having had a MMF threesome...All related on a primal, emotional level to the question "Can I be sure I'll really be raising my own kids?"
A FFM threesome on the other hand....I can't speak for the letter writer, but if my wife brought home one of her gorgeous friends that would be quite alright with me.