ALmost every day
One of my ex's was kinky as hell. Her and a friend 'kidnapped' me after work, blindfold and everything then drove out to the woods and they had their way with me. After I came while her friend was sitting on my face they pretended to leave me and drove off. There I lay naked blindfolded and handcuffed. She returned a few moments later without her secret friend and picked me up.
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 actually did one year. I don't think I make a very good looking woman but my GF and her friends at the time said they would make me a knockout. After two hours of makeup and dressing I say I was kind of hot. It was still obvious I was a man and my GF dressed as a man so we were quite the attraction at the bar. This was the early 90s in the Midwest so if it wasn't Halloween it wouldn't have been accepted as easily. There were a couple guys that through conversation heard I was bi and asked if I would suck cock dressed like this. I was able to suck one guy in the bathroom. The GF was a little upset cause she wanted to find a guy that we could both play with that night.
We did end up with one guy back at his hotel and had a great 3 some.