We all fantasise about having a threesome.
What is your favourite kind of threesome? MMF, FFM, MFM, MFM.
If you are interested in exploring your bi side you or your partner might be interested in trying out FFM or MMF. The attention is either on the women or on the men. If you happen to enjoy your lady having the attention of two men at once then you might want to try MFM.
Believe it or no the order of these letters matter, as in MFM distinguishing that both men are going to focus on the lady and MMF meaning that there is some bi play intended between the men.
It is really important that all parties boundaries are respected and that everyone has the same expectations.