Guys, why did you cheat?

I wasn’t getting it at home

Came down to opportunity for me. While visiting a friend for sports and beer, I went to my buddy's garage to have a smoke, and his wife was in there lying on the workbench pulling a train with 3 other guys. I got in line, because I had always wanted to fuck her. It was hard to say no to that one.

Variety, plain and simple. Cheated several times, always just for the sex with zero interest in any kind of relationship. None could hold a candle to my wife in skill, and only one was on par in attractiveness. But they were all wonderfully freaky ass sluts who got off on things like gang bangs, sex in adult theaters, and fucking strangers they'd just met like me. All things my wife would never even think of doing. Oh, and in one case fucking a married woman multiple times in her own marital bed was a huge rush.
It was purely recreational, just to scratch an itch. Always played safe and got to do things most people wouldn't believe could actually happen in real life. Never let it draw energy or attention away from my wife. I felt terribly guilty and still do when I think about it. But I had a need that I had to deal with before I get old and hopefully I got it out of my system. No interest in straying with another woman now. Very happy at home with the woman I love.

An utterly boring sex life. Like dead fish boring. No passion! Not adventurous just blah.

Wife doesn't want sex very often and when she does there are too many strings attached. My gay neighbor doesn't care that I go over just for sex. The girl at work will eventually want a relationship so I'll have to cut her off soon

Plain and simple? we like fucking

I had always been curious about giving a bj. I thought about it so much I had to find out.

In my case, it was the proverbial chink in the armor, formed when I suggested we "play" ( bdsm scening ) with another couple I'd met online, and, then, r/t. We met them, and played together, after a safety period, and getting to know them. There was all the restraint, and whipping stuff, and oral, and hand jobs, all around. It was all in full view with all parties, full consent. My wife took that and ran with it, hooking up with several online b/f's , unbeknown to me. So, my first cheat in twenty-five years of marriage was with a young lady who's pussy was new to me, she was far younger and prettier than my wife, and definitely better at sucking and fucking, but, the biggie was, she made me feel loved and desired, something my wife never really did. We eventually hashed all of this out, reconciled, even joined forces with some of her lovers for threesomes. But, the truth is, the intimacy we once had went away, and hasn't returned.