Threesome question....

So I have had my share of girl on girl action. I’ve also had a threesome, but just one time. I’ve told my boyfriend/fiancé about my experiences. One night he and I got to talking (dirty talking) and to spice things up I got into the whole “what if I had a threesome with my best friend”. He thought about it. And then he warmed up to the idea. He wants to watch me and another girl do stuff (him no touching, just watching). Now he won’t stop talking about it. It’s been 3 months since that first conversation about a threesome.

My question is, how do you find people that are down for things like this? All the people I have had my experiences with were friends of mine, but they are all grown up with kids of their own, or they have moved away with their significant others. I told him to find someone because I literally have just 2 friends I even talk to. He had SO many friends that it overwhelms me. I’m super introverted. lol. I also have preferences, and things I’d like to stick to to keep it safe. But again, I don’t know how to go about finding someone. Any suggestions from those who have done this sort of thing?