9. Avoid picking someone from work.
Learned from: Zack and Miri Make A Porno (2008)
Complex says: It should really be called "acquaintances with benefits." Everyone's been there: Someone's drunk and/or lonely, and then there's a weird make-out session in your office bathroom during the company Christmas party. This is perfectly fine if you've never met the person before; say, a friend of a friend.
It gets ugly, however, when it's someone you and/or your friends see on a regular basis. If things end badly, your friends have constantly check invite lists so you two don't run into each other. Imagine how worse it'll get once you become the subject of inter-office gossip and you have to sit next to her everyday.