Hello, i have an almost perfect relation. I love her and she loves me. We are togheder for almost an year and a half. We are both 19 and we both were virgins. We decided to start our sex lives togheder so we did, but it didn't work too well. We can kiss and cuddle for hours turn each other on and she makes me someotimes think my penis will just pop/explode of how hard it can get. We make out for hours and i have a straight-hard erection all these hours withiout it getting even a bit soft, around 3 hours i stayed hard. BUT the moment we decide to go further i lose my erection completly. Most exactly when i have to put the condom on, my erection just dies all of the sudden. I have no ideea what the hell to do, i'm desperate! I cannot say i'm impotent cause i get hard very easy, it's enough to kiss my girl and i get hard, she's beautifull and more important we share a very strong love bond, our relation is perfec(except this problem). This problem has persited for a month or so(we only tried having sex 7 times or so dough cause we didn't have the oportunity-time and location). She's been excelent, very understanding and we talked about it alot. If she gives me oral sex i can get hard again, but once she or I take the condom in our hands i get soft. I belive that the condom represents the fact that we will surely have/try to have sex and this is the reason i get soft. I want her, i want her badly all the time so i can't say in those moments i;m not in the mood. Any ideeas what;s the matter and mor eimportant how to correct this?