Hi I had done sex twice few days back .this was the first I had sex and I used condom but in both the occasions I am unable to ejaculate .even in the first case the condom got teared and I had sex for more than 2 hours for where I couldn't able to cum .my gf had cum twice during the intercourse after that I had to ejaculate myself. Do not know what is the cause and I am depressed. Suggest me whether it's a problem or masturbation is its cause.