I found a blog post with someone asking for MFM threesome advice. I left the following comment and thought it might be useful for my readers here:
I couldn’t tell you how many times I’ve had MFM threesomes with various women. Probably a third of them were with my (now ex-) wife and the rest were at sex parties with other women. They were all great fun.
My advice to anyone trying a threesome for the first time is for the minority gender, the woman in this case, to not worry about satisfying both of their other playmates. This is a time for them to lay back and enjoy the attention. If you worry about making two people happy you are taking on double the “work” load and you will stress about that too much.
If they are like me they will have a great time without getting quite as much attention from you as they usually would.