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Bisexual is pretty much MMF. That term conjures up visions of two (or more men) with a woman present participating in the shenanigans.
As stated, FFM is usually classified as group or gangbang (although, I always consider gangbang consisting of more than two men). This is also different, IMHO from group/orgy, which may be several people but they aren't all banging the same person.
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