You know the expression, “Don't dip your pen in the company ink”? As a rule of thumb, it's never a good idea to have sex with coworkers. But that's not so much a rule as it is a suggestion. One rule you must always, always follow is don't have sex with a friend's girlfriend. Trust me. The sex might be amazing but the fallout afterwards might make you regret the whole thing. Sorry to break it to you. Sex with ex girlfriends might be cool but just check with your friend first. You never know what's waiting to blow up in your face. Luckily, there are millions of girlfriends and ex girlfriends in the world and very few of them are your friend's girlfriend. Why risk all kinds of trouble when we have thousands of ex girlfriend pics and girlfriend sex videos ready to give it up to whoever likes their stuff. Find a girl friend (in picture and video format only) here on Sex.com.