If you haven't met anyone who interested you, it can be pretty tough and difficult. I was pretty lucky with mine. My first wife had an old gf that we would get together with, and we had another guy friend, who we invited to join us too. I felt that we had been with her gf a few times, that it would only be fair to indulge the wife too. What I didn't know, was that he was actually gay. We were in bed, and she nudged him to my cock, and actually liked him sucking me. She asked me if I was interested, and of course I enjoyed sucking his cock too. Eventually we had a new year's eve thing, for a few years. After kids, this all stopped.
My second wife was really into pussy, and through riding motorcycles, we happily joined the swinging life and ended up partying with 2 regular couples, but at different times. Both of the guys were just orally bi, and that was fun to me. Sadly, that ended after several years, and the second wife and I split ( extenuating circumstances...death of a family member, and a huge chemical dependency problem that bankrupted us) but I still have amazing memories.
I recently had ideas of finding a guy who has the same ideas, but haven't been able to find the right person, close. Came very close about 4 years ago, but the guy leveled with me and said he wasn't STD free. I absolutely appreciated his honesty. That is something that you really have to ask and watch out for. Lately, this chubby guy is messing with two local friends, and I'm enjoying it. Couple Friday's ago was an amazing time, and looking forward for taking them both on motorcycle rides soon. Maybe I will find a guy who is interested, but I'm good right now with my local girls Best of luck!