I think threesomes are difficult whether it's MFM or FMF. I always feel like someone gets left out. Plus, I just prefer to concentrate all my attention on just one person at a time. I guess it would be different if the 3rd person was just observing and not participating. I've never made love with other bi females, only gay females, and they definitely weren't interested in having a male watch, much less participate. Though now that I am about to get married, all of that is history anyway.

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Communication is the key.