Yes, I love threesomes and love when it is MMF. I have had multiple (well over 200) and am in threesomes on a regular basis with a full time boyfriend who lives with us and my husband.
Yes, I would and have been involved in threesomes. Mostly MMF, but I've had several FMF threesomes over the years as well. My girl prefers MFM threesomes so that's our usual.