Definitely something that I have enjoyed many times over the years. Started with my first wife while we were dating. We went camping with a couple friends that we hung out with often. We went to a nudist resort together a few times, and I learned that my wife had actually dated Bill and Karen before they became a couple. Hell it was the 80's and being bi wasn't any taboo then. Hell my parents had a pool, and had nude parties when I was 12-16 yrs old. Being nude around my house was never discouraged.
We finally had that evening when we were camping at a cabin in the mountains. We rented a cabin, and it was heated only by the fireplace. Had a very bad cold snap, Bill and I split plenty of wood, we had all showered, and was ready for bed. Played a few drinking and truth or dare( no truth at all...all dare) of course we were completely nude together, and climbed under the covers to get warm. Before long we had roving hands, roving mouths, and we screwed each other. The girls finished each other by licking each other's pussies, and they wanted to fuck one more time, but my gf with Bill, and me fucking Karen. I was hard, but Bill wasn't. I went ahead and sucked Bill's cock, and the girls played with each other watching me.
Another time the gf and I slept with a friend of hers who was bi, and he couldn't keep his mouth off of my cock.
Second wife and I enjoyed the swapping partners lifestyle, but with only people we had hooked up with riding motorcycles. Was a select few couples.
Last time I sucked cock was about 10 years ago, I had a good friend I had met at a local bar. She was very young, and never hid her bisexuality. A couple of times we slept with her roommate and her boyfriend. I enjoyed screwing both of the girls, and he and sucked each other's cocks a few times....but me being 20 years older than the 3 of them... was fun....but I was really into older women.
Now married a 3rd time, sadly the wife is an invalid, and in a wheelchair. Sex is pretty much non existent
I do have a neighbor who I get to see a couple of times a month, and she is awesome. Still looking for another bi couple to be with