Guys, when you brush the back of your hand against a girl's ass, is it intentional?

Anonymous
Today, as I was walking in the corridors, I felt something on my ass but at first, I thought it was another girl's bag (there was a lot of people).

But after some seconds, I noticed my friends weren't walking next to me so I looked behind and noticed a guy walking next/behind me on the side of my ass I felt something.

Then as I was slowing down, they (him and his friends) passed me and I didn't feel anymore the back of his hand brushing up against my ass.

Of course there was a lot of people in the corridor, but I, myself, don't touch or brush up against other people's ass because of it.

I was wondering, do you think it was intentional? If so, why do some guys do it?
Updates
+1 y
His hand stayed quite a long time for him to not notice it
Updates
+1 y
I didn't react as I wasn't sure
Guys, when you brush the back of your hand against a girl's ass, is it intentional?
4 Opinion