I’ve had FMF threesomes with my husband and another woman several times and I enjoy them. I do this often for my husband’s birthday. However, as a cock slut I much prefer MFM threesomes.
We do both MFM and FMF quite often. FMF are harder to come by and I jump at the opportunity even though I'm not really bi. I'll admit that MFM are more sexually satisfying for me but two ladies on Bob puts a big smile on his face and that's also satisfying for me too.