Has anyone ever experienced a very hard, harder than usual boner during sex when they have a more than full bladder? to explain better... I discovered this a while back when I woke up and my girl was ready to go, I had to go to the bathroom but I was also super hard, so i said, forget it I will just do it, she said she never felt an erection that hard ever, it was a little bit of discomfort because i had to pee but felt good. I tried it again drank a bunch of water and got an erection and had sex, same thing "i never felt anything so hard" -- Did i discover a trick, or has this been a known fact for a while? and can this cause any harm?