Seeking genuine advice or guidance

Recently my husband and I have stepped into a bit of a new world. Primarily around his desire for me to be with other men.

I was with a guy he introduced me to from his gym and the thought or idea of adding another guy to join me and the guy from my husband’s gym to play together sometime

While no real plans have been established since the topic came up I wanted to learn from others who have participated in a threesome. I’m not sure this will happen for certain but I figured it could be good to better understand something like this before fully considering.

Sorry for the bit of a rambling message and would appreciate any advice. And please reserve your judgment, I’ve already received some for being with another man at my husband’s desire