MFM..... which providers are game?

Shortly after my divorce almost 15 years ago, a buddy of mine had me over for dinner. Little did I know he and his wife were swingers. As the evening progressed and one bottle of wine turned into three, I was in the middle of a MFM encounter. This lasted over a year. He enjoyed watching me with his wife and it was very erotic to share her with another man. Now, I consider myself straight, never been with a man, but you definitely have to be secure in your manhood as swords tend to cross and friendly fire occurs. My question is for the providers..... who of you would be willing to see two guys at once? And to the guys..... which ones have or would be willing to try?