Which is more acceptable, FFM or MMF?

Jinmetsu_Rasetsu
I just wanted to ask, generally, in terms of threesomes, what is socially accepotable? Just curious, because it has been a long time debate amongst my circle of friends. Besides, I am curious as to what you all would say about it. Personally, I have been in 2 threesomes in my distant past (FFM type) and I would never imagine myself in a MMF threesome though... LOL
Two Guys and a Girl?
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Which is more acceptable, FFM or MMF?
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