Will this work ?

At 15, your body is still going through all sorts of upheavals, ups and downs. Many people as they get older remember their teens as, 'I got a hardon every time the wind blew,' but they forget that there were also the down periods as chemicals in the body are at a constant struggle to establish equilibrium. That's the way chemicals try to balance things out. It's like a sugar rush, followed by a sugar crash, then another slightly lower sugar rush then another lower sugar crash, up and down, up and down, until things balance out. To experience periods of times where you are unable to have sex is perfectly naturally, even at 15.

 

Being 15, I highly doubt PMO has anything to do with you not being able to get it up during sex. You have only been doing it 2 years, I started before I was 12, I'm 22 now, that's over 10 years and I never yet had a problem getting hard when it came to sex. Maybe your nervous, or your not really attracted to the girl, there are many reasons. I'm not here to judge, I lost my virginity at 15, but your only 15; that's too young to be having sex, I know, I did it, it was a mistake. Like what Fr0sti3 said, your body is going through tons of changes, maybe when you tried your hormones just weren't right that day. Focus on important things right now bro, doing well in school, sports, figuring out what you wanna do in life. Don't let this addiction take you to the levels it has taken a lot of us, if you can nip it in the bud now then you will be forever grateful when you get older, in college, and really start having relationships and sex.