Learned from: Friends With Benefits (2011)
Complex says: Firmly established rules are key here; you have to make sure you're both on the same page. Take it to the 21st century like Mila Kunis and make them vow on your iPad's Bible app that there will be nothing more than sexual intercourse between the both of you. Thou shall give the relationship an end date, promise to withhold emotions, not monologue a declaration of love at the heat of passion, and never text message unless it's for sexual inquiries.