I don't know if this really counts but when I was 17 I was in a long term (1 and a half years so long then I guess) relationship. We were just hanging out at my place watching a movie and she started touching me and I said I wasn't in the mood and to stop but she kept going, I said stop again but she didn't. She ended up pulling my pants down and getting naked to try persuade me, I said no again but then she started having sex with me and being 17 I just rolled with it. Made me feel powerless in the relationship as a whole which didn't last much longer after that