Sorry, this one made me chuckle a little bit.
It's normal for people to occasionally have an "accident", but if you mean someone that goes around like that everyday, then NO it's not normal.
ages 15-20, then no it's not normal.. 21 on up.. skidmarks are very common.. I know cuz I do my family's laundry and you should see my dad's and my brothers' tighty whiteys.. they look like aging chinese flags
It's normal for people to occasionally have an "accident", but if you mean someone that goes around like that everyday, then NO it's not normal.