I was introduced to it, when the first wife and I were still dating. After we had some great fun with an old gf of hers ( yes she was dating a girl before meeting me) she asked if we could add a guy. Of course I said yes, and another friend of hers who I knew joined us. Another good time. He leaned over and began to suck my cock. At first, I was apprehensive, but she said just relax, and I truly enjoyed him sucking me to orgasm. I rolled over, and did the same for him. I really enjoyed it. Him and I would also get together many times by ourselves. I did try anal back then, but I just had trouble with it. ( pain, and couldn't get over the feeling of having to poo) I gave him anal several times. He even had a girlfriend who would join us several times too. She was so excited by it. The first wife and I eventually split, and I started to date someone else. We had some freeking amazing sex, and soon I found out that she was very much into lesbian porn. ( she always loved for me to cum in her mouth after fucking her pussy too)
One night a friend of hers stayed over after a big fight with her bf, and we had all been drinking and the three of us slept together. Her friend and her bf had gotten back together a day later, and the next time they came over to party and play games, the evening turned into a nude, and then swapping partners night. After a few times that we had slept all together, I told my gf, about my past, she told her gf, and us guys got into sucking each other off, and the girls loved it because, of how much we loved watching them eating each other's pussies.
We made friends with another couple and partied with them often too.
Sadly those times ended, and we split up. Of course was over money, and her chemical addiction.
The gf who I call (old gf) on my posts, she and I had some fun with a guy friend of hers a couple of times, but that was back in 2017. Current gf and I have talked about it, but we only get together several times a month, and we just don't have the time to pursue it. Time will tell.