I actually had a great FWB relationship for years. I think what helped is we would try and set each other up on dates with others who we thought were a good match. We are still friends today 20 years later and we are both married (not to each other) and we are also freinds with our significant others and they know that we 'dated' in the past. Hearing stories from others though this is a rarity, I am thankful I had such a great friendship with someone of the opposite sex.
I wrote a story about sex with friends (m & f)
check it out https://www.lushstories.com/stories/masturbation/more-good-friends
Jeanie wants to hang with the guys
Masturbation