I am a male of 21 years and I have a habit of masturbation. Yesterday I was running with my friends and I got pain near pennis, the pain lasted only for 2 minutes and I was okay but after coming home when I tried masturbating I could not feel any reaction in pennis. I'm afraid thinking what wrong happened. I cannot go to a doctor directly due to some personal issues please tell me all the possible things that could have happened and what should I do so that it will react. I tried watching porn also but there is no reaction there now.