I am sure there are more bad experiences than some like to admit to. By far my worst was with my ex-wife. It wasn't just a sexual mismatch or anything like that. She had started cucking me by doing one of our much older nearby neighbors. He was experienced and actually pushed the envelope to take us where we wanted to go, namely her being his sex partner while I watch and participate in cleanup, etc. All was great for about a year and a half until he moved for work. It took a while to get my ex back on that horse but when she did, it was with a guy she had met one night while out with her girlfriends. With her first bull, I was always present to watch and we made it a rule but with this new guy, she asked if she could do him alone the first time (with me nearby for safety). We did and I did get to sneak a few peeks in and everything seemed to go well. She told me after the sex was great and she may want to see him again sometime, so I told her to tell him about me and our "arrangement". Well that was the last I heard of it for a while. I found out later that even though I allowed her to be with whomever she wanted, she started seeing him behind my back and he became very possessive. I found out about it accidentally and by this time, he had convinced her to leave me and the ******* and live with him. It had gone beyond sex. Well, as crushing as that was, it was even more so when after about a month or so, he left her to go back with his wife. We had to try and pick up the pieces and although she came back home and we had some more time together, things had changed and other things started to affect our marriage to the point where a couple years later we got divorced. I can't say it was because of the sex with him but that was definitely the start of it. The odd thing was, even after we divorced I often thought about those times watching her with our neighbor and couldnt' see to get hard or get off unless I was thinking about that. I guess once a cuck always a cuck ?