Well i was 15 when i first tried having sex with a girl. I couldn't get up and we never had sex. Later when i was 16 i had been dating a girl for 9 months and we successfully had sex (though we were completely used to being naked with each other). We had sex many times over the course of the next year and i never had any problems with getting hard. Though after we broke up i tried to have sex with another girl and once again the problem came up once again. I went back to having sex with her for a while and i never had an issue (never lost it during sex either). We eventually stopped and 2 months later me and a girl were in bed about to have sex and i couldn't get up. I don't know what to do and yes it's very frustrating and embarrassing. I don't know what the deal is, i have no problem getting hard around my ex or with myself but i cant when its with a new partner and i dont always have time to get to know the new girl. I dont think its nerves because im not nervous...