Office sex: it's more common than you think

Each day you come to work and sit at your desk for another eight hours of the daily grind.  You probably sit in a less than comfortable office chair in front of a computer that hasn't been cleaned in months.  You might visit the copy room a time or two during the day and of course you'll hide in the bathroom a few times a day to kill work time.  The one thing that isn't on your mind is what was going on in these locations the night before.

It turns out that everyone is having office sex.  Some are jerking it in the communal bathroom while others are fucking on your desk after hours.  What drives people to take such risks?