Would you show the boyfriend the pictures?

Say you are good friends with a guy and he has a longtime boyfriend (boyfriend is only a friendly acquaintance).

You went out with your friend group, you took group pictures and when you took a good look at the pictures you see through a mirror behind everyone that guy friend is grabbing one of your girl friend's butt under her skirt, in ALL of them. They obviously didn't see the mirror behind them.

Would it mean anything to you or because he's gay, would you assume it was just a harmless thing?