Spontaneous erections are ones that pop up for no reason at all. No titillations or even a thought about sex and you have a hard on.
·        It happens to a lot of teenagers. Hormones give the penis a life of its own. When guys get older spontaneous erections happen less frequently. Erections get more and more connected to sex.
·        The erection normally goes away pretty quickly if you ignore it.
·        Spontaneous erections can be embarrassing. One way to hide it when you have your clothes on is wearing tight briefs and wide trousers. When you get spontaneous erections when you shower with your friends after sports, you can go to the bathroom beforehand and jerk off. This decreases the chance of a spontaneous erection a few minutes later when you take a shower.