I've had a MMF threeway when I was drunk with my ex boyfriend and his friend. That's about it though. Would definitely like to try it again and/or take more men on in a gangbang and try double penetration.
As for MFF threesomes, I'd have to initiate it and know the girl because I'd get super self conscious and shy about it.
Twice. Both FFM. I wrote stories about both, but neither can be posted on Lush due to TOS issues. If they ever stop being church ladies, I may post them.
long ago...a FFM sandwich, I highly recommend it!
I barely missed out on a MFM manage a trois....the F asked me for my participation, but before it happened she moved away....