When I was with one of my ex's about 15 years ago. I was in my early 20s and she was a bartender and would always get hit on. I would pick her up from work and find out customers would buy her flowers or other types of gifts. To make it worse she was a complete flirt with guys she interacted with and it made a lot of them think they had a chance with her, even tho she was taken. I would get extremely jealous, especially since I was young at the time. Until one day I was watching porn and came across a scene where the girl looked like her and I imagined that was another man fucking my girlfriend. It turned me on so much. I asked her if she would and she accepted, but on the condition I watch and be there which is what I wanted all along. She didn't want anyone from work so we found someone online and arranged a quick 30 minute 'meeting' in the backseat of our car and we both had a nice thrill. Then he left and we had sex for hours, making use of our horniness. We're both with other people now, 2 years on but she still gets hit on and I get turned on by that.