I am a 17 year old male. since i was about 14 i have been a pretty horny guy, masturbating just about everyday. About a couple of months a noticed i was beginning to be less horny, around this time is where i met my first girlfriend who i am currently dating, and since being with her i masturbate maybe once or twice a week and rarely ever feel horny, its not just her its every girl. the other night we were doing stuff and planning to have sex, but i just couldent get hard at all, may be stress?