Is it normal to get erections for no reason?

Yes, erections can happen for no reason at all; these are called “spontaneous erections.” Teens with penises can get erections when they don’t even feel turned on. They can happen without warning and at embarrassing times. They happen to most people with penises who are going through puberty. Spontaneous erections happen a lot less once a person finishes puberty, although adults still get them every once in a while.