You mentioned that when a man is full he can hold semen for up to three ejaculations. I have ejaculated once Saturday and also Sunday without porn or lustful thoughts. Could it be that I need one more time because I still get heavily aroused randomly?
Don’t measure your need to ejaculate by how often you have erections. Erections are normal for young men but don’t really tell you how aroused you are. Instead, save masturbation for times when it seems the erections won’t go away and your thoughts are constantly being interrupted by sex.