I'm happily married and would never end it. But I also have fantasies. It doesn't mean I'm unhappy with my marriage. It just means we know ourselves as individuals and also know ourselves as a couple.

First love was a girl I met in a bar when I came home from college. She offered to come up the next weekend. It lasted for about a year and then she wanted to see other people. Thrn we got back which was a mistake. She went back to school. Ended up sleeping with a few guts from class. She told me that she was finding other guys attractive too. I told her, that that's OK as long as she wasn't sleeping with them. She told me, she kind of was.
If that happened now. I would have been more accepting. But she was only the second woman I had sex with and the first I really loved.
My first was in college. She was in a class under me and worked as a stripper as well. I met her at a party. I didn't even want to go out that night because I had to work the next day. She was standing at the door and started flirting with me as soon as I walked in. We wound up at a bar. We danced and drank. Some other guy tried to move in on her. I thought I was cockblocked, but she came back over. We started making out and she asked if I wanted to hang out at my place. She showed me her stripper moves. We wound up in the shower were she she gave a few sucks on my dick and we went into my bedroom to continue it. I told her that I would rather put it in her pussy. So I fucked her missionary, rolled back to put her on to and came. We woke up a few hours later and I fucked her from behind.
She thought it was too much that I was virgin and didn't want to have a monogamous relationship so cut off that fling by the next month.