Like eyescream, a few of mine have lasted beyond their expiration date because of sex, which sometimes continued beyond the point when I broke up with them. It wasn't just sex, I still loved them and I had affection for them and I enjoyed their company, so staying too long with them wasn't harmful to me, I was also just sure that we weren't meant to be together and it was time for me to move on.
I've stayed a few times because of hope. I loved them and I wanted to give the relationship a chance to improve because of how happy I used to be in the relationship. I believed that our relationship could become as good as it was before I was unhappy. Twice it improved. Once it didn't and I stayed in that one too many years.
I think I stayed in the relationship I was in just before TheBoyfriend for a month too long because of how badly I wanted to sleep with TheBoyfriend. Let me explain... My boyfriend and I had been dating for a few months and he hadn't had sex with me in two weeks, which is a problem I'm not used to having with a boyfriend. The only reason why I even met TheBF was because my boyfriend had stood me up that night, for the very first time but not the last. So there I was, horny and upset at my boyfriend, when a hot guy shows up out of nowhere and he's smart, funny, charming, sexy, athletic, with a great body and a bubble butt, gorgeous eyes that he knew how to use to maximum effectiveness, and he was obviously interested in me. I wanted him so badly! But I've never cheated on anyone and I've never begun a new relationship before the old one was over, so I tried to ignore him for as long as I could until I began feeling like I was starting to be mean, and then I gave in and joined in the conversation with him. That night, he asked me out to dinner, and I told him that I would love to, except I couldn't because I had a boyfriend. He tried to convince me and all my friends to go swimming in our underwear at a downtown hotel. I opted not to go because I could tell that if I went swimming in a hotel pool in my underwear at midnight and I had one alcoholic beverage, then we'd be screwing until the sun rose in one of the hotel rooms. The next day my female friends went on and on about how beautiful TheBF's body was and four of them spied on him while he was changing and told me he was hung. I thought they were exaggerating in order to be humorous. The next week I had a few erotic dreams about him where I showed up where he was living, which I knew about because he mentioned the place and I was familiar with it, and I knocked on the door and he opened it and knew why I was there and then he just grabbed me and kissed me and we had hot sex all night. The next week my boyfriend kept standing me up, started avoiding my phone calls, and still wasn't sleeping with me, and TheBF seemed to just show up at just the right time. That's when I saw him on one of his post-workout runs for the first time, the ones that I'd heard about from my female friends. I had no idea that he would look so hot all sweaty with his shirt clinging to his chest and his torso like that. His post-workout runs were worth watching over and over and over again. I've never seen a man look who looks so beautiful when he runs. If I hadn't met TheBF I would have broken up with my boyfriend a week after he stood me up, but now I was resisting temptation to jump TheBF's bones and I felt like I'd be giving up on my boyfriend because of how badly I wanted to sleep with TheBF, so instead of breaking up with my boyfriend when I should have, I tried to make it work for another whole month where we still didn't have sex. In retrospect, I realize how flawed my reasoning was, but I really wasn't able to reason at the time. My loins were on fire for a man I wasn't supposed to be lusting after and I felt full of guilt over it, so I overcompensated by trying harder with a guy who obviously really didn't want me or deserve me. I've said before that if I didn't govern my behavior by following my personal code, then I'd be an out of control slut, but sometimes I take "trying to be good" too far!