Originally Posted by Bbucko
MMF means that the two males interact sexually with each other; MFM means that they only interact sexually with the woman.
One is a heterosexual act, the other is a bisexual one. It's not just "semantics".
I think the same way, but a little bit different.
The MMF is obviously bisexual act, there's no discuss.
Is in the MFM one where resides the discuss since there's the possibility to fuck in the same hole and some people believe that 2 cocks rubbing together inside a vagina/ass is a bi act.
I believe it's hetero, since it's just a special case.