While I was sitting at my computer diddling around on the internet, I got bored and my hand ventured into my pants. Instead of masturbating, I just gripped my mostly limp, but somewhat swollen member, and started rubbing the head on the inside of my nylon shorts. I started feeling this friction based, warm tingling sensation in the head, so I continued doing it until it felt too amazing to contain, and I shot about one or two small squirts of clear, odorless, fairly watery liquid. I then proceeded to do it 2 more times in no more than 5 minutes. Is this normal?