Remember, safety in numbers. If you're always surrounded by people, it's much easier to remain on your best behavior. When you begin spending too much time alone together, the one-on-one sessions can quickly turn into something a bit more amorous. And while we're on the subject, one subject you and your platonic friend shouldn't be on is sex. And definitely not sex with each other. Consider sex a four-letter word, a topic that's totally off limits. Should it ever come up in passing, change the subject immediately. You don't want to put any ideas in your head. We all know that when talking about hot and heavy subjects, one thing can lead to another. It's great to have friends of the opposite sex because it brings some versatility into your life. However, it's best to proceed with caution. Remember, accidents happen, even among the best of friends.