Why do men watch these things?

So me and some girl friends go out for a night out of the town with our mothers and nieces to spend some time with our family and when we get back we caught our men watching an adult video on the television in the family room.

So when we opened the door it was like seeing cock roaches scatter when the lights turn on and it took us only a second to figure out with all the red faces and the noise coming from the back round what they were watching. And needless to say it made things a little weird for the rest of the night.