How to avoid emotions with a sex buddy?

Easy answer: You can't! Being that close of friends then adding sex ( which whether you want to admit it or not is highly emotional as well as physical) means that in the end some emotions are going to be there. You have to decide if you can keep those emotions in check or not. If you can't you have to quit being sex buddies. If you can enjoy yourself! You just have to decide and follow through. No more going back and forth and you can't let him either. If you want this to continue all the emotional crap has to be thrown out.