Yeah, it's been pretty great, frankly. I used to do a fair variety of drugs, nothing too serious, but she never did. She once asked me what mushrooms were like, and I was like, "Why not find out for yourself?" so I grew up a batch after a shit ton of trial and error, lol.
She's my best friend, but it takes so much work. Everybody scoffs at how often, "communication" is bandied about as the key to a relationship, but yeah, it's that.
That's what the, "friend" part of FWB is for. That's how we did it. My wife isn't demi, but she finds it hard (if not impossible) to get off with a stranger. It's an anxiety thing.
What we did is, we looked around for friends, people we liked and enjoyed being around. No pressure, just if it happened, it happened. And eventually we found people we vibed with.
I'm not saying it works for everyone, but with zero pressure on all sides, it did for us.